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Critical Reasoning: Argument Evaluation

176 questions

All types176Multiple choice143Multiple select3True / False25Matching5
Question 61Question →

Analysis of sediment cores from a lake adjacent to a Bronze Age settlement reveals a sudden, steep decline in oak tree pollen accompanied by a dramatic increase in grass pollen around 1200 BCE. Archaeologists conclude that the settlement's inhabitants deliberately cleared the surrounding oak forests to expand agricultural land for crop cultivation. However, several paleoclimatologists contend that a regional shift toward severe aridity during the same period caused the natural die-off of the oak trees. Which of the following, if true, most strengthens the archaeologists' conclusion?

Show answer & explanation

Answer: Sediment layers corresponding to 1200 BCE contain high concentrations of domesticated cereal grain phytoliths and micro-charcoal particles characteristic of controlled field burning, while oxygen-isotope ratios in the same layers indicate stable precipitation levels.

Answer

The statement showing high concentrations of domesticated cereal grain phytoliths, controlled field burning charcoal, and stable oxygen-isotope precipitation levels provides the strongest support for the archaeologists' conclusion.
The correct response strengthens the argument on two fronts. First, it offers direct physical proof of human farming activity (cereal phytoliths and controlled slash-and-burn field clearing markers). Second, it disproves the paleoclimatologists' counter-hypothesis by establishing through oxygen isotopes that precipitation remained stable during the period, ruling out drought as a natural cause.

Step-by-Step Solution

1
Deconstruct the argument structure
Premise: Oak pollen dropped while grass pollen spiked around 1200 BCE. Conclusion: Inhabitants cleared forests for crop cultivation. Counter-claim: Natural drought caused the forest die-off.
To strengthen a causal argument challenged by an alternative explanation, one must either rule out the alternative cause or supply direct evidence confirming the proposed mechanism.
2
Evaluate the competing hypotheses
The argument pit anthropogenic land clearing against natural aridity/drought.
The correct option must show evidence of human crop cultivation and/or evidence that drought did not occur.
3
Assess the impact of the correct evidence
Demonstrating cereal phytoliths and controlled burning confirms human agricultural activity, while stable oxygen-isotope ratios disprove the aridity hypothesis.
This dual impact eliminates the primary counterargument while providing direct corroborating evidence for the author's conclusion.

Key Concept

Strengthening Causal Arguments via Alternative Cause Elimination and Direct Evidence
Question 62Question →

To reduce municipal expenditures on stormwater drainage maintenance, the city of Oakhaven recently replaced non-native turf along major roadways with deep-rooting native shrubs known to absorb large volumes of groundwater. City officials reasoned that because these shrubs absorb up to 40 percent more groundwater during severe storms than non-native turf, storm runoff entering the municipal drainage network will decrease substantially, thereby lowering ongoing maintenance costs over the next decade.

Which of the following, if true, most seriously weakens the city officials' argument?

Show answer & explanation

Answer: The deep root systems of the mature native shrubs expand into subterranean drainage pipes, causing structural blockages that require repairs far more costly than routine drainage maintenance.

Answer

The argument is most seriously weakened by the finding that the deep root systems of the mature native shrubs expand into subterranean drainage pipes, causing structural blockages that require repairs far more costly than routine drainage maintenance.
The correct answer identifies a direct, unintended side effect of the planted native shrubs: their deep roots cause subterranean pipe damage requiring repairs that exceed routine maintenance costs. Because the total financial burden will increase rather than decrease, this fact directly invalidates the city council's conclusion.

Step-by-Step Solution

1
Deconstruct the argument structure
Premise: Native shrubs absorb 40 percent more groundwater during storms than non-native turf. Conclusion: Replacing turf with native shrubs will lower municipal stormwater drainage maintenance costs over the next decade.
Identifying the premise-to-conclusion link isolates the core assumption: that reducing runoff volume is the sole factor determining overall drainage maintenance costs.
2
Identify the unstated assumption and logical vulnerability
The argument assumes that planting native shrubs will not create new, unexpected costs that outweigh the maintenance savings from reduced storm runoff.
In plan-to-goal feasibility arguments, a common vulnerability is an unconsidered negative side effect that prevents the goal (cost savings) from being realized.
3
Evaluate options for information that undermines the assumption
The option describing root intrusion into underground drainage pipes shows that the shrubs cause severe pipe blockages, generating repair expenses greater than the original maintenance budget.
Demonstrating that the plan creates higher maintenance costs directly shatters the conclusion that overall maintenance spending will decrease.

Key Concept

Evaluating Plan Feasibility and Unintended Side Effects in Causal Arguments
Question 63Question →

In 2024, a major telecommunications firm deployed an automated diagnostic tool to its field technicians, designed to streamline the resolution of residential network hardware failures. Internal audits confirmed that the tool accurately identified hardware faults in over 95 percent of cases, reducing the average diagnostic phase of each service call from forty minutes to five minutes. Furthermore, overall customer requests for residential hardware repairs remained virtually unchanged over the subsequent twelve months. Nevertheless, the total number of labor hours billed by field technicians for completing residential hardware repairs increased by more than twenty percent during that same period.

Which of the following, if true, most helps to resolve the apparent discrepancy described above?

Show answer & explanation

Answer: The rapid diagnostic process routinely revealed secondary hardware vulnerabilities that technicians previously lacked time to detect, requiring complex on-site repairs that took hours to perform.

Answer

The apparent discrepancy is best resolved by the fact that the rapid diagnostic process routinely uncovered secondary hardware vulnerabilities that required complex, time-consuming on-site repairs.
The correct answer provides a missing operational factor that bridges the gap between faster diagnostics and higher overall labor hours. If the quick diagnostic tool exposes previously unnoticed secondary hardware problems during routine calls, technicians will execute additional complex repairs on-site. Consequently, even though the call count and initial diagnostic time decreased, the total repair labor per call increased sufficiently to drive up total billed hours.

Step-by-Step Solution

1
Identify the two contradictory premises in the stimulus.
Premise 1: Time spent diagnosing hardware decreased from 40 minutes to 5 minutes, and repair request volume remained constant. Premise 2: Total labor hours billed for hardware repairs increased by over 20%.
Resolving a paradox requires isolating both empirical facts that must hold true simultaneously.
2
Determine the necessary operational bridge to reconcile the conflict.
Need a factor that adds significant labor time to each service visit without increasing the total number of customer requests or diagnostic time.
If diagnostic time fell and request count stayed flat, the increase in total hours must come from additional non-diagnostic repair work performed during those service visits.
3
Evaluate the option choices to find the statement that accounts for both premises.
The discovery of previously undetected secondary defects during visits explains why labor hours per visit expanded considerably despite faster diagnostics and stable call volumes.
This provides a logical, non-contradictory explanation for the net increase in total labor hours.

Key Concept

Resolving Paradoxes: Identifying a Third Variable
Question 64Question →

A municipal transit authority recently introduced electric buses on city routes to reduce urban air pollution. City officials claim that expanding this electric bus fleet will significantly improve overall air quality in the downtown area over the next two years. However, critics point out that generating electricity for these buses relies on nearby coal-fired power plants.

Which of the following, if true, provides the strongest support for the city officials' claim?

Show answer & explanation

Answer: The coal-fired power plants operate with advanced filtration systems that emit significantly fewer pollutants per unit of energy produced than conventional gasoline-powered buses.

Answer

Power generation for electric buses produces significantly fewer emissions per unit of energy than conventional gasoline buses emit.
The city officials claim that expanding the electric bus fleet will improve downtown air quality, but critics raise concern about the emissions from coal-fired power plants supplying the electricity. The statement that coal plants produce significantly fewer emissions per unit of energy than conventional buses directly resolves the critics' objection, proving that replacing old buses with electric ones creates a net reduction in pollution.

Step-by-Step Solution

1
Identify the main conclusion and the vulnerability brought up by critics.
Conclusion: Expanding electric buses will improve downtown air quality. Objection: Electricity generation relies on coal power plants.
To strengthen an argument facing a potential counter-factor, new evidence must demonstrate that the net effect remains positive.
2
Evaluate the impact of comparing emissions per unit of energy.
If coal power generation releases fewer pollutants per energy unit than traditional bus engines, switching to electric buses lowers overall emissions.
This confirms that the objection does not outweigh the environmental benefits of the electric bus fleet.

Key Concept

Strengthening an argument by neutralizing a counter-argument and establishing net benefit
Question 65Question →

Archaeologists studying ancient agricultural settlements along the Zanja River basin found that around 3,000 years ago, crop yields increased dramatically immediately following the adoption of terraced hillside farming. The lead researchers concluded that the construction of terraces was the direct cause of this agricultural surplus, as terraces prevented soil erosion and retained rainfall on cultivated slopes. Which of the following, if true, most strengthens the lead researchers' conclusion?

Show answer & explanation

Answer: Neighboring lowland settlements along the Zanja River that did not adopt terraced farming experienced no increase in crop yields during the same historical period.

Answer

The argument is strengthened by establishing that lowland settlements without terracing experienced no yield increase, effectively ruling out broader external factors and providing a control group.
The correct answer provides a comparison group: neighboring settlements in the exact same region that did not construct terraces saw no increase in crop yields. This demonstrates that the yield increase was specific to the settlements that implemented terraced farming, ruling out broad environmental factors (such as favorable weather across the whole basin) and strengthening the causal link.

Step-by-Step Solution

1
Identify the core argument and conclusion
Premise: Crop yields surged after adopting terraced farming. Conclusion: Constructing terraces directly caused the crop yield increase by preventing erosion and retaining water.
To strengthen a causal argument, one must support the causal connection or rule out alternative explanations.
2
Evaluate potential strengthening mechanisms
Demonstrating that the effect (increased yields) did not occur in similar populations where the cause (terraced farming) was absent acts as a control group, strongly supporting the causal claim.
Ruling out regional confounding variables confirms that terracing was the specific factor driving the yield improvement.
3
Match against the available options
The option comparing neighboring lowland settlements without terracing directly serves as this control group.
It eliminates the possibility that a widespread regional factor increased yields everywhere.

Key Concept

Causal Argument Strengthening via Control Group / Eliminating Alternative Explanations
Estimated Time:2m 0s
Question 66Question →

Recently, local business leaders argued that lowering municipal corporate taxes would automatically spur job creation in the city. However, this argument ignores the fact that businesses base hiring decisions primarily on consumer demand rather than local tax rates. In fact, previous tax cuts in neighboring districts failed to generate any measurable employment growth. Therefore, the proposal to lower corporate taxes is unlikely to achieve its intended goal of increasing local employment.

In the argument above, the two boldface portions play which of the following roles?

Show answer & explanation

Answer: The first is a claim presented to undermine a position advocated by local business leaders; the second is the author's main conclusion.

Answer

The first boldface statement is a claim presented to undermine a position advocated by local business leaders, and the second boldface statement is the author's main conclusion.
The passage begins by presenting a position held by local business leaders. The author then introduces a pivot word ('However') followed by the first boldface statement, which introduces a fact meant to challenge and undermine the business leaders' position. After providing additional evidence, the author concludes with the second boldface statement, introduced by 'Therefore', which represents the argument's main conclusion.

Step-by-Step Solution

1
Identify the main conclusion of the passage
The final sentence ('the proposal to lower corporate taxes is unlikely to achieve its intended goal...') represents the author's main conclusion.
It is signaled by 'Therefore' and expresses the ultimate judgment of the author regarding the proposal.
2
Determine the function of the first boldface statement
The statement after 'However' highlights a critical flaw in the business leaders' reasoning, showing why tax cuts won't necessarily lead to hiring.
It acts as a premise/claim that counters the opposing viewpoint and supports the author's final conclusion.
3
Match the identified roles to the correct option choice
The option stating the first statement undermines the business leaders' position while the second statement serves as the main conclusion is correct.
This accurate description maps directly to the logical flow of the passage.

Key Concept

Analyzing Boldface Statement Roles and Argument Structure
Question 67Question →

A commercial vineyard introduced autonomous weeding robots designed to eliminate weeds using targeted laser bursts instead of traditional chemical herbicides. After one year of using the robots, the vineyard recorded a 20 percent increase in grape yield per acre compared to the previous year. The vineyard manager concluded that eliminating chemical herbicides in favor of laser weeding directly improved the productivity of the grapevines. Which of the following, if true, most strengthens the vineyard manager's argument?

Show answer & explanation

Answer: Neighboring vineyards in the same region that continued using traditional chemical herbicides during the same year experienced no increase in grape yield per acre.

Answer

Neighboring vineyards in the same region that continued using traditional chemical herbicides during the same year experienced no increase in grape yield per acre.
The conclusion asserts a direct cause-and-effect relationship between switching to laser weeding robots and increased grapevine productivity. The statement showing that neighboring vineyards subject to the same climate experienced no yield increase while continuing herbicide use serves as a control group. This rules out broader environmental factors (like ideal weather) as the true cause of the yield increase, thereby significantly strengthening the manager's causal conclusion.

Step-by-Step Solution

1
Identify the premise and conclusion of the argument.
Premise: Grape yield per acre increased by 20% after switching from chemical herbicides to laser weeding robots. Conclusion: Replacing chemical herbicides with laser weeding directly improved grapevine productivity.
Understanding the precise causal link asserted by the author is essential for evaluating candidate strengthening statements.
2
Determine the underlying assumption and potential vulnerabilities.
The argument assumes that no other factor (such as weather, irrigation, or pest changes) was responsible for the increased yield during that year.
Causal conclusions in GMAT Critical Reasoning are vulnerable to alternative causes; ruling out an alternative cause strengthens the conclusion.
3
Evaluate the options to find evidence that eliminates alternative explanations or confirms the causal link.
The statement regarding neighboring vineyards acting as a control group confirms that regional factors (like weather) alone were not responsible for the yield jump, thus isolating laser weeding as the primary driver.
A control group finding directly strengthens a causal claim by ruling out confounding environmental variables.

Key Concept

Strengthening Causal Arguments by Ruling Out Alternative Causes
Question 68Question →

A winery recently released thousands of beneficial predatory beetles into its vineyards to combat vine mites, which damage grape crops. At the end of the harvest season, the winery reported a 20 percent increase in usable grape yield compared to the previous year. The vineyard manager concluded that introducing the predatory beetles was the primary reason for the increased crop yield.

Which of the following, if true, most strongly supports the vineyard manager's conclusion?

Show answer & explanation

Answer: Vineyards in the same immediate region that did not introduce predatory beetles experienced no increase in grape yield over the same period.

Answer

Vineyards in the same immediate region that did not introduce predatory beetles experienced no increase in grape yield over the same period.
The argument attributes the 20 percent yield increase specifically to the introduction of predatory beetles. The correct response strengthens this causal claim by providing a control group: neighboring vineyards under similar environmental conditions that did not use beetles saw no increase in yield. This eliminates general regional factors (like weather or rainfall) as alternative causes, making it much more likely that the beetles caused the increase.

Step-by-Step Solution

1
Identify the conclusion and premises
Premise: Beetles were released and grape yield increased by 20%. Conclusion: The beetles caused the yield increase.
Isolating the causal assertion is required before evaluating strengthening evidence.
2
Determine how to strengthen a causal claim
A causal claim is strengthened by showing that when the cause is absent, the effect does not occur, or by ruling out alternative explanations.
Establishing a control comparison isolates the proposed cause as the key variable.
3
Evaluate the choices for a valid control group or eliminated alternative cause
The statement showing neighboring vineyards without beetles had no yield increase serves as a control group, supporting the conclusion.
This makes it significantly more likely that the beetles, rather than general regional conditions, caused the yield increase.

Key Concept

Strengthening Causal Arguments via Control Groups
Question 69Question →

A logistics company recently replaced its human-driven delivery fleet with autonomous electric vans in City Y. Over the subsequent six months, management noted a sharp decrease in parcel delivery delays across the city. Management concluded that switching to autonomous electric vans was directly responsible for the improved delivery timeliness. Which of the following, if true, most strongly supports management's conclusion?

Show answer & explanation

Answer: During the six-month period, City Y experienced no major changes in traffic congestion, road construction, or total parcel volume.

Answer

The statement that City Y experienced no major changes in traffic congestion, road construction, or total parcel volume during the six-month period provides the strongest support for the conclusion.
The correct answer strengthens the argument by ruling out potential confounding factors (such as decreased traffic or reduced package volume). If traffic and workload remained constant, it becomes significantly more likely that the new autonomous vans were indeed the factor responsible for the reduced delivery delays.

Step-by-Step Solution

1
Identify the conclusion and premises of the argument.
Premise: Delay times dropped after introducing autonomous vans. Conclusion: The autonomous vans caused the reduction in delays.
Understanding the precise causal claim (autonomous vans -> reduced delays) is essential to strengthening it.
2
Determine what assumptions or vulnerabilities exist in the causal argument.
The argument assumes that no other external factor (like lighter traffic or fewer packages) caused the delay reduction.
In Causal Strengthening questions, ruling out alternative potential causes solidifies the author's proposed cause.
3
Evaluate the options to find the statement that eliminates alternative causes.
Confirming that traffic, roadwork, and parcel volume remained stable eliminates potential confounding variables.
If external conditions remained unchanged, the introduction of the autonomous vans stands as the primary difference responsible for the outcome.

Key Concept

Ruling out alternative explanations to strengthen a causal claim
Question 70Question →

In 2025, an agricultural cooperative in Colombia introduced a dense shade-tree canopy across its member farms to protect organic coffee crops from intense summer heat. Agricultural sensors confirmed that the canopy successfully reduced crop microclimate temperatures by several degrees during peak summer months, eliminating heat stress on the plants. Furthermore, total rainfall and soil nutrient levels remained identical to historical averages. Nevertheless, during the summer harvest, the average yield of harvestable coffee beans per acre across these farms fell by nearly 20 percent compared to previous unshaded years.

Which of the following, if true, most helps to account for the unexpected decrease in coffee bean yield?

Show answer & explanation

Answer: The shade-tree canopy provided an ideal nesting habitat for a local bird species that feeds heavily on ripening coffee cherries just prior to harvest.

Answer

The resolution is that the new shade-tree canopy created a habitat for a bird species that consumed a significant portion of the ripening coffee cherries before they could be harvested.
The correct answer provides an unintended consequence of installing the shade canopy: attracting birds that ate mature coffee cherries. This explains why physical plant health and reduced heat stress did not translate into higher harvested yield, resolving both facts simultaneously.

Step-by-Step Solution

1
Identify the two conflicting facts presented in the stimulus.
Fact 1: The shade canopy successfully lowered temperatures and eliminated heat stress under stable moisture and nutrient conditions. Fact 2: Despite these favorable growing conditions, the per-acre yield of harvestable coffee beans dropped by 20%.
Resolving a paradox requires understanding both facts without disputing either one.
2
Determine the required mechanism for resolution.
A valid resolution must introduce a new factor associated with the shade canopy or lower temperatures that negatively impacts harvestable yield despite healthy plant growth.
The correct option must reconcile the reduced yield with the absence of heat, water, or nutrient stress.
3
Evaluate the choices to find the statement that explains the discrepancy.
The option noting that the shade canopy attracted seed-eating birds explains how healthy crops produced fewer harvestable beans due to pre-harvest consumption by birds.
This bridges the gap between healthy plant growth and lower harvested output.

Key Concept

Resolving Paradoxes and Apparent Discrepancies
Question 71Question →

To reduce the loss of native pollinator populations, agricultural planners in Region X recommend that almond growers replace synthetic pesticides with a newly developed bio-fungicide derived from soil bacteria. The planners argue that adopting this bio-fungicide will significantly increase total annual crop yields across Region X. They base this claim on field tests showing that orchards treated with the bio-fungicide sustained 40 percent less honeybee mortality than orchards treated with synthetic alternatives.

Which of the following, if true, provides the strongest support for the agricultural planners' argument?

Show answer & explanation

Answer: The bio-fungicide is at least as effective as synthetic pesticides at controlling the fungal infections that typically cause severe almond crop losses in Region X.

Answer

The argument is most strongly supported by the statement establishing that the bio-fungicide is at least as effective as synthetic pesticides at controlling fungal infections in Region X.
The conclusion asserts that replacing synthetic pesticides with bio-fungicides will increase overall crop yields because reduced honeybee mortality improves pollination. However, for total yields to increase, the bio-fungicide must also successfully perform its primary job: protecting crops against fungal disease. The correct option establishes that the bio-fungicide is at least as effective as synthetic pesticides in preventing fungal crop losses. By ruling out the possibility that fungal damage will spike and offset pollination gains, this choice provides essential support for the conclusion.

Step-by-Step Solution

1
Analyze the argument structure
Premise: Orchards treated with bio-fungicide showed 40 percent lower honeybee mortality compared to synthetic pesticides. Conclusion: Adopting bio-fungicide will significantly increase total annual almond crop yields.
Identifying the premises and conclusion reveals the underlying logic gap between lower bee mortality and total crop yield.
2
Identify the unstated logical gap
The argument assumes that saving honeybees will raise yields without introducing new yield-reducing factors, such as failing to protect crops from fungal disease.
If the bio-fungicide fails to suppress fungal outbreaks, crop loss from disease could outweigh the pollination benefits of reduced bee mortality.
3
Evaluate the option that closes this logical gap
Confirming that the bio-fungicide matches synthetic pesticides in controlling disease removes a major potential weakness, ensuring a net yield gain.
A strengthening statement must validate key assumptions or eliminate competing explanations that would undermine the conclusion.

Key Concept

Strengthening Causal & Comparative Arguments by Ruling Out Deficits in Alternative Functions
Question 72Question →

Coastal towns along Gulf Bay recently enacted mandatory nocturnal light-shielding regulations near beach areas to encourage endangered loggerhead sea turtles to nest. Marine biologists observed a 25 percent increase in recorded turtle nests on Gulf Bay beaches in the season following the mandate's implementation. Consequently, conservationists concluded that the light-shielding regulations were directly responsible for the increased nesting activity along Gulf Bay.

Which of the following, if true, most strongly supports the conservationists' conclusion?

Show answer & explanation

Answer: Beaches in adjacent regions that experienced identical weather and tidal conditions but did not implement light-shielding regulations saw no increase in loggerhead nesting activity during the same period.

Answer

Beaches in adjacent regions that experienced identical weather and tidal conditions but did not implement light-shielding regulations saw no increase in loggerhead nesting activity during the same period.
The correct option provides a control comparison that isolates the light-shielding policy as the cause of the increased nesting. By showing that adjacent beaches sharing identical environmental factors (weather and tides) but lacking the policy did not see any nesting increase, it effectively eliminates alternative environmental explanations.

Step-by-Step Solution

1
Analyze the argument structure.
Premise: Mandatory light-shielding regulations were enacted, followed by a 25% increase in loggerhead turtle nests. Conclusion: Light-shielding regulations directly caused the increase in nesting activity.
Identifying the core causal premise and conclusion is essential before evaluating potential strengthening evidence.
2
Identify logical vulnerabilities in the causal leap.
The argument assumes correlation implies causation and overlooks alternative potential causes, such as favorable weather, tidal changes, or regional turtle population growth.
Causal arguments on the GMAT can be strengthened by ruling out alternative explanations or supplying a control comparison.
3
Evaluate the choices for a strengthening mechanism.
Showing that nearby control beaches with identical environmental conditions but no lighting regulations experienced no change in nesting activity isolates the light regulations as the primary cause.
A control group confirms that the observed effect occurs only when the proposed cause is present.

Key Concept

Strengthening Causal Arguments via Control Comparison
Estimated Time:1m 30s
Question 73Question →

A logistics company recently replaced human inspectors with an automated software system designed to audit shipping manifests for tariff misclassifications. Whenever discrepancies are flagged, the affected containers undergo mandatory physical inspections. Management claims that adopting this software will decrease total vessel departure delays attributable to documentation errors, despite critics pointing out that the automated software flags twenty percent more paperwork discrepancies than human inspectors previously identified.

Which of the following, if true, provides the strongest support for management's claim?

Show answer & explanation

Answer: The automated software audits manifests days prior to vessel arrival, enabling inspections of flagged containers to finish before loading begins, whereas human inspectors flagged errors during active loading.

Answer

The argument is most strongly supported by the statement indicating that automated auditing occurs prior to vessel arrival, allowing physical inspections to finish before loading begins rather than interrupting active loading.
The correct response bridges the logical gap between increased discrepancy flags and reduced departure delays. By establishing that automated audits occur before vessel arrival, inspections are completed prior to loading. This eliminates the active loading disruptions caused by human inspectors, directly supporting management's claim.

Step-by-Step Solution

1
Identify the conclusion and premises of the argument.
Conclusion: Adopting the software will decrease vessel departure delays caused by paperwork errors. Premise: The software flags 20% more discrepancies than human inspectors did, leading to mandatory physical inspections.
To strengthen an argument, one must first identify the logical gap between the premise (more flagged discrepancies creating inspections) and the conclusion (fewer departure delays).
2
Evaluate the missing assumption or logical gap.
The critics argue that more flags equal more inspections, which should cause more delays. Management's claim can only hold true if the inspections triggered by the software do not interfere with departure schedules.
A valid strengthening statement must explain why an increase in flagged discrepancies will not translate into vessel departure delays.
3
Assess the correct option against the logical gap.
If automated auditing takes place prior to vessel arrival, physical inspections are completed before loading starts. Under human inspection, errors were caught during loading, directly holding up departures.
Shifting the inspection window entirely out of the active departure timeline explains how total departure delays decrease even though more containers are inspected.

Key Concept

Strengthening Arguments via Timing and Operational Mechanisms
Question 74Question →

In 2025, a commercial real estate management firm equipped all thirty of its downtown office towers with automated occupancy-sensing climate control and lighting systems designed to reduce energy consumption. Independent audits confirmed that the automated systems operated flawlessly, reducing electricity usage per occupied floor during working hours by 25 percent. Nevertheless, total annual electricity consumption across all thirty towers increased by 8 percent over the following year, even though overall building occupancy rates and local weather patterns remained virtually unchanged.

Which of the following, if true, most helps to resolve the apparent discrepancy described above?

Show answer & explanation

Answer: The automated system's software default overrode manual overnight shutdown protocols, causing main ventilation chillers to run continuously at baseline levels after business hours rather than shutting off.

Answer

The statement explaining that the automated system's default software overrode overnight shutdown protocols, causing HVAC equipment to run continuously after business hours, resolves the paradox.
The correct answer provides a missing factor that reconciles both seemingly contradictory facts. If the automated control software prevented heating and cooling equipment from shutting down overnight as it previously did manually, the new off-hours electricity consumption could easily outweigh the 25 percent energy savings achieved during business hours, resulting in an overall 8 percent annual increase.

Step-by-Step Solution

1
Identify the two conflicting facts in the stimulus.
Fact 1: Electricity usage per occupied floor during working hours decreased by 25%. Fact 2: Total annual electricity consumption increased by 8%, despite constant occupancy rates and weather.
Resolving a paradox requires finding a missing piece of information that allows both premises to be true simultaneously.
2
Evaluate the scope of the two facts.
Fact 1 is limited to working hours and occupied floor efficiency. Fact 2 measures overall annual consumption across all 24 hours of the day.
A discrepancy between a subset rate (working hours) and a total measure (annual consumption) often hinges on what happens outside the subset (non-working hours).
3
Select the option that introduces a mechanism bridging the gap between working hours and non-working hours.
The option introducing continuous overnight operation of major HVAC chillers accounts for substantial new off-hour consumption without contradicting the working-hour efficiency gains.
This explains how total consumption could rise despite decreased working-hour consumption per floor.

Key Concept

Resolving Paradoxes and Apparent Discrepancies
Question 75Question →

In 2025, a coastal region designated a 50-mile marine sanctuary where commercial fishing was strictly prohibited, aiming to restore depleted populations of yellowtail snapper. Over the following two years, biological surveys confirmed a marked increase in the adult yellowtail snapper population within the sanctuary. Paradoxically, during the same period, commercial fishing fleets operating in the unrestricted waters immediately surrounding the sanctuary reported a significant increase in their average daily catch rate of adult yellowtail snapper per vessel, even though total fishing effort outside the sanctuary remained unchanged and no technological upgrades were adopted.

Which of the following, if true, most helps to resolve the apparent discrepancy described above?

Show answer & explanation

Answer: As the yellowtail snapper population inside the sanctuary expanded, large numbers of adult fish naturally migrated into the adjacent unrestricted waters in search of food.

Answer

As the yellowtail snapper population inside the sanctuary expanded, large numbers of adult fish naturally migrated into the adjacent unrestricted waters in search of food.
The correct answer provides a spillover mechanism: as the protected fish population grows and resources inside the reserve become constrained, adult fish migrate into adjacent open waters. This naturally increases fish density in unrestricted zones, enabling fishing vessels to catch more fish per day without changing their equipment or increasing effort.

Step-by-Step Solution

1
Identify the two contradictory premises in the stimulus.
Premise 1: Snapper population inside the sanctuary increased. Premise 2: Daily catch rates per vessel outside the sanctuary also increased despite no changes in fishing effort or technology.
Resolving a discrepancy requires clearly isolating the two facts that appear mutually exclusive.
2
Determine the necessary condition for a valid resolution.
The correct option must introduce a new factor showing how population growth inside the reserve directly leads to higher fish density in open waters.
A valid resolution reconciles both premises without contradicting either stated fact.
3
Evaluate the choices for a bridging mechanism.
The choice describing outward migration of adult fish from the crowded sanctuary into surrounding waters connects the population rise inside to higher catch rates outside.
This 'spillover effect' explains how both empirical trends can occur simultaneously.

Key Concept

Resolving Paradoxes and Apparent Discrepancies
Question 76Question →

In the mid-twentieth century, manufacturing plants employing automated assembly lines recorded higher worker productivity per hour and lower unit production costs than plants using manual assembly methods. Nevertheless, among plants that operated profitably and sold 100 percent of their output, total operating profits were consistently higher at manual plants producing custom, low-volume goods than at automated plants producing standardized, high-volume goods.

If the statements above are true, which of the following must also be true regarding the manufacturing plants during the specified period?

Show answer & explanation

Answer: The average selling price per unit of custom goods produced at manual plants was higher than the average selling price per unit of standardized goods produced at automated plants.

Answer

The average selling price per unit of custom goods produced at manual plants was higher than the average selling price per unit of standardized goods produced at automated plants.
The correct answer must be true based on the algebraic relationship between total profit, production volume, unit costs, and unit selling prices. Given that manual plants produced a lower volume of goods (QM<QAQ_M < Q_A) with higher unit production costs (CM>CAC_M > C_A) yet earned higher total operating profit (QM⋅MarginM>QA⋅MarginAQ_M \cdot Margin_M > Q_A \cdot Margin_A), the profit margin per unit for custom goods (PriceM−CMPrice_M - C_M) had to be greater than that for standardized goods (PriceA−CAPrice_A - C_A). Combining PriceM−CM>PriceA−CAPrice_M - C_M > Price_A - C_A with CM>CAC_M > C_A logically forces PriceM>PriceAPrice_M > Price_A.

Step-by-Step Solution

1
Analyze the mathematical relationship for total profit.
Total Profit = Quantity Sold × (Unit Selling Price - Unit Cost).
Establishing the core profit formula allows us to compare manual plants producing custom goods (MM) and automated plants producing standardized goods (AA).
2
Identify the given comparative premises.
1) Unit Cost for manual plants is greater than Unit Cost for automated plants (CM>CAC_M > C_A). 2) Quantity sold for manual plants is lower than for automated plants (QM<QAQ_M < Q_A). 3) Total Profit for manual plants is greater than for automated plants (ProfitM>ProfitA>0Profit_M > Profit_A > 0).
Extracting the quantitative constraints provided in the passage sets up the logical inequality.
3
Evaluate the profit per unit constraint.
Since QM⋅(PriceM−CM)>QA⋅(PriceA−CA)Q_M \cdot (Price_M - C_M) > Q_A \cdot (Price_A - C_A) and 0<QM<QA0 < Q_M < Q_A, it must hold that (PriceM−CM)>(PriceA−CA)(Price_M - C_M) > (Price_A - C_A).
For a smaller quantity of goods to yield a larger total profit than a larger quantity of goods, the profit margin per unit for the smaller-quantity goods must be strictly greater.
4
Deduce the relationship between selling prices.
Since (PriceM−CM)>(PriceA−CA)(Price_M - C_M) > (Price_A - C_A) and CM>CAC_M > C_A, adding CMC_M to both sides gives PriceM>PriceA+(CM−CA)>PriceAPrice_M > Price_A + (C_M - C_A) > Price_A. Thus, PriceM>PriceAPrice_M > Price_A.
Because manual unit costs were higher, the unit selling price of custom goods produced at manual plants had to be higher than that of standardized goods to yield both a higher unit margin and higher overall profit.

Key Concept

Quantitative and Logical Deductions from Mathematical Constraints
Estimated Time:2m 0s
Question 77Question →

Prior to 2022, technology firm X generated over 80 percent of its annual revenue from software licensing, with the remainder derived from consulting services. In 2022, Firm X introduced a cloud platform, offering it exclusively via usage-based subscriptions. By 2025, Firm X's total annual revenue was twice that of its 2021 revenue. However, its 2025 software licensing revenue had dropped by exactly 50 percent relative to 2021, while its consulting revenue remained unchanged. All 2025 cloud platform subscription revenues were generated from clients who had never previously purchased software licenses or consulting services from Firm X.

If the statements above are true, which of the following must also be true about Firm X in 2025?

Show answer & explanation

Answer: Clients who had never purchased products or services from Firm X prior to 2022 accounted for more than half of the firm's total annual revenue in 2025.

Answer

In 2025, clients who had never purchased products or services from Firm X prior to 2022 accounted for more than half of the firm's total annual revenue.
The correct choice must strictly follow from combining the mathematical premises. In 2021, licensing was over 80% of revenue and consulting was under 20%. In 2025, total revenue doubled (2R2R). Licensing revenue fell to half its 2021 level (under 40% of RR, or under 20% of 2R2R), while consulting revenue remained unchanged (under 20% of RR, or under 10% of 2R2R). Thus, all non-cloud revenue combined accounted for under 30% of 2025 total revenue (2R2R). Since all cloud platform revenue came from new clients who had never purchased from Firm X prior to 2022, these new clients generated over 70% of 2025 total revenue, which is strictly greater than half.

Step-by-Step Solution

1
Express the 2021 revenue breakdown algebraically.
Let RR be the total revenue in 2021. Software licensing revenue L2021>0.80RL_{2021} > 0.80R and consulting revenue C2021<0.20RC_{2021} < 0.20R, with L2021+C2021=RL_{2021} + C_{2021} = R.
Establishing 2021 baseline figures allows precise comparison with 2025 figures.
2
Calculate the maximum revenue generated in 2025 from clients who purchased products prior to 2022.
In 2025, total revenue is 2R2R. Licensing revenue L2025=0.50×L2021<0.40RL_{2025} = 0.50 \times L_{2021} < 0.40R. Consulting revenue C2025=C2021<0.20RC_{2025} = C_{2021} < 0.20R. Total revenue from returning client streams is L2025+C2025<0.40R+0.20R=0.60RL_{2025} + C_{2025} < 0.40R + 0.20R = 0.60R.
Since cloud subscription clients are strictly new clients, returning client revenue consists solely of licensing and consulting.
3
Calculate the minimum contribution of new cloud platform clients to 2025 total revenue.
Cloud platform subscription revenue P2025=2R−(L2025+C2025)>2R−0.60R=1.40RP_{2025} = 2R - (L_{2025} + C_{2025}) > 2R - 0.60R = 1.40R. As a fraction of 2025 total revenue (2R2R), cloud revenue is P20252R>1.40R2R=70%\frac{P_{2025}}{2R} > \frac{1.40R}{2R} = 70\%.
Comparing new client revenue to the 2025 total (2R2R) proves that new clients accounted for over 70% of total revenue, which is strictly greater than 50%.

Key Concept

Quantitative and Proportional Deductions in Logical Arguments
Question 78Question →

Read the following argument carefully:

In an effort to reduce drug development costs, several biotechnology firms have proposed replacing traditional human clinical trials with advanced artificial intelligence predictive modeling. Many health policy analysts argue that this substitution will inevitably compromise patient safety because AI algorithms cannot account for rare biological interactions. However, this concern is largely misplaced. AI models are designed to synthesize vast genomic datasets that human researchers cannot process, identifying dangerous interactions far earlier in the development pipeline. Consequently, adopting predictive modeling will ultimately enhance, rather than diminish, drug safety protocols.

True or False statement: In the argument above, the first boldfaced statement provides evidence supporting the main position defended by the author, while the second boldfaced statement expresses that main position.

Show answer & explanation

Answer: False

Answer

The statement is False. The first boldfaced portion presents an opposing viewpoint that the author refutes, while the second boldfaced portion provides supporting premise evidence for the author's conclusion rather than stating the conclusion itself.
The evaluation statement is false because it completely reverses and misidentifies the rhetorical roles of both boldfaced portions. The first boldfaced statement introduces an objection raised by health policy analysts that the author rejects ('concern is largely misplaced'). The second boldfaced statement supplies premise evidence demonstrating how AI early-detection operates, which supports the author's main conclusion articulated in the final sentence.

Step-by-Step Solution

1
Identify the author's main conclusion and overall stance in the argument.
The main conclusion is the final sentence: 'adopting predictive modeling will ultimately enhance, rather than diminish, drug safety protocols.' The author supports the adoption of AI predictive modeling.
Locating the main conclusion is critical for evaluating how other claims in the passage relate to the author's position.
2
Determine the structural role of the first boldfaced statement.
The first boldfaced statement ('Many health policy analysts argue...') expresses an opposing position asserting that AI substitution compromises patient safety. The author disputes this in the next sentence ('However, this concern is largely misplaced').
This statement represents a counterargument that the author argues against, not evidence supporting the author's stance.
3
Determine the structural role of the second boldfaced statement.
The second boldfaced statement ('AI models are designed to synthesize vast genomic datasets...') provides a reason explaining why AI improves safety early on.
This statement serves as a supporting premise that leads to the final conclusion, not as the main conclusion itself.
4
Evaluate the truth value of the target statement.
Because both parts of the assertion incorrectly describe the roles of the boldfaced statements, the assertion is False.
A statement claiming that the first boldface supports the author and the second boldface is the main conclusion misidentifies both structural components.

Key Concept

Analyzing structural roles of boldfaced statements (distinguishing counterarguments, supporting premises, and main conclusions)
Question 79Question →

Telecommunication firms operating subsea fiber-optic cables currently rely on annual physical inspections by diving teams to detect outer armoring degradation. However, divers can only safely inspect shallow-water segments near coastal landings, leaving deep-sea stretches unexamined. To decrease catastrophic cable ruptures, a major operator plans to replace diving inspections with automated acoustic monitoring. This system emits continuous sonar pulses along the cable's internal core, detecting structural micro-fractures in the outer armoring across its entire length. The operator claims that implementing this technology will reduce the overall number of unexpected cable ruptures.

Which of the following, if true, provides the strongest support for the telecommunication operator's claim?

Show answer & explanation

Answer: A significant majority of deep-sea cable ruptures originate from gradual micro-fracturing of the outer armoring rather than sudden events such as undersea landslides.

Answer

The argument is most strengthened by establishing that a significant majority of deep-sea cable ruptures originate from gradual micro-fracturing of the outer armoring rather than sudden events such as undersea landslides.
The correct answer provides critical support by establishing that the primary cause of deep-sea cable ruptures is gradual micro-fracturing of the armoring. Because the acoustic monitoring system is specifically designed to detect micro-fractures along the entire cable length, proving that deep-sea failures stem from this specific defect confirms that expanding monitoring to deep waters will successfully detect impending failures and reduce overall ruptures.

Step-by-Step Solution

1
Deconstruct the argument into premise and conclusion.
Premise: Divers only inspect shallow waters; acoustic monitoring continuously monitors micro-fractures along the entire cable including deep-sea stretches. Conclusion: Replacing divers with acoustic monitoring will reduce overall unexpected cable ruptures.
Understanding the logical jump from premise to conclusion reveals the gap in the author's reasoning.
2
Identify the logical vulnerability/assumption in the argument.
The argument assumes that deep-sea ruptures are actually caused by micro-fractures (which the new system detects) and that monitoring deep water will yield actionable warnings before catastrophic failures occur.
If deep-sea ruptures are caused by sudden unpredictable events (like landslides) rather than micro-fractures, monitoring micro-fractures won't prevent those deep-sea failures.
3
Evaluate choices for the option that bridges this logical gap.
Confirming that deep-sea ruptures primarily stem from gradual micro-fractures directly links the capabilities of the acoustic technology to the stated goal of reducing total ruptures.
Validating this key assumption strengthens the causal link between implementing the monitoring system and preventing ruptures.

Key Concept

Strengthening Arguments via Assumption Confirmation
Estimated Time:2m 0s
Question 80Question →

Municipal water authorities in a large urban district recently installed high-sensitivity acoustic sensors along major underground distribution conduits to detect structural micro-fractures before major pipe bursts occur. Although installing and maintaining these sensors requires a substantial initial financial investment, utility administrators conclude that deploying the network will decrease the city's total annual water infrastructure repair expenses over the next five years. Which of the following, if true, provides the strongest support for the utility administrators' conclusion?

Show answer & explanation

Answer: Addressing minor micro-fractures proactively costs a small fraction of the expense required to fix catastrophic pipe ruptures and repair surrounding municipal road infrastructure.

Answer

The statement showing that repairing minor micro-fractures proactively costs a small fraction of fixing catastrophic ruptures provides the strongest support for the conclusion.
The argument concludes that investing in acoustic sensors will lead to a net reduction in annual repair costs. To strengthen this claim, an option must show that early detection translates into cost savings that exceed the cost of the sensors and minor repairs. The statement explaining that repairing micro-fractures costs only a small fraction of repairing major burst damage provides this critical link, confirming substantial net savings.

Step-by-Step Solution

1
Deconstruct the argument core
Premise: Acoustic sensors detect micro-fractures early but require high upfront and maintenance investments. Conclusion: Sensor deployment will lower total annual infrastructure repair expenses over 5 years.
Understanding the gap between the cost of the intervention and the claimed net savings is essential.
2
Identify the unstated assumption required to strengthen the conclusion
The money saved by preventing major bursts must outweigh the cost of installing sensors and fixing micro-fractures.
To prove a net decrease in spending, the savings mechanism must be financially validated.
3
Evaluate the choices for logical impact
Demonstrating that proactive micro-fracture repairs cost only a small fraction of catastrophic burst repairs confirms that early detection yields substantial net savings.
This establishes that the financial benefit directly exceeds the expenditure required for implementation.

Key Concept

Strengthening a financial trade-off argument by confirming that cost savings exceed implementation expenses.
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