Critical Reasoning: Argument Evaluation

Between 2018 and 2024, all commercial solar farms in Country X that integrated lithium-iron-phosphate (LFP) battery storage systems achieved continuous grid synchronization during peak demand hours. Conversely, no solar farm relying exclusively on nickel-manganese-cobalt (NMC) storage maintained uninterrupted grid connectivity throughout those same peak periods. During this six-year period, any solar farm in Country X that failed to maintain continuous grid synchronization during peak demand hours was assessed a regulatory surcharge. Furthermore, every commercial solar farm built in Country X after 2020 integrated either LFP or NMC storage systems, but never both.

Based on the information provided, which of the following statements must be logically true? Select all that apply.

A regional agricultural authority plans to subsidize the replacement of traditional flood irrigation with subsurface drip irrigation across farms in a drought-prone river basin. Because subsurface drip irrigation reduces per-acre water loss to evaporation by 35 percent, the authority concludes that implementing this technology region-wide will substantially increase the total volume of water remaining in the basin's underground aquifer each year. Which of the following, if true, most seriously weakens the agricultural authority's argument?

To combat declining wild bee populations, environmental officials in Region X plan to restrict the agricultural use of neonicotinoid pesticides, citing a study showing that bee colonies in uncultivated nature reserves suffer far lower mortality rates than those near commercial farmland. The officials conclude that enforcing this restriction across all farms in Region X will restore local wild bee populations to healthy levels.

Which of the following is an assumption on which the environmental officials' argument depends?

From 2015 to 2023, all municipal transit authorities in Region M derived their annual operational funding exclusively from passenger fares and regional tax subsidies. In 2019, a regional ordinance mandated that any transit authority receiving more than 40 percent of its operational funding from passenger fares must provide discounted passes to senior citizens. Furthermore, under the ordinance, no transit authority could receive regional tax subsidies if passenger fares accounted for more than 50 percent of its operational funding.

If the statements above are true, which of the following must also be true about municipal transit authorities in Region M after the 2019 ordinance took effect?

In GMAT Critical Reasoning, evaluating the validity of an argument using the Test of Variance requires that applying two opposite extreme answers to a evaluation question (such as 'yes' and 'no') produces opposite impacts on the strength of the conclusion.

A regional agricultural board plans to encourage commercial fruit orchard operators to replace conventional synthetic pesticide sprays with a newly developed biological control agent consisting of predatory mites. Because extensive field trials demonstrated that these predatory mites effectively eliminate target pest insects without producing any chemical runoff into adjacent waterways, board officials claim that widespread adoption of the mites will result in a significant net reduction of toxic chemical contamination in the region's river ecosystem. Which of the following would be most useful to investigate in order to evaluate the validity of the agricultural board's claim?

Consider the following argument:

A regional agricultural authority plans to mitigate groundwater depletion by offering financial subsidies to farmers who replace water-intensive flood irrigation systems with high-efficiency drip irrigation. The authority argues that because drip irrigation reduces per-acre water consumption by 30 percent, implementing this subsidy program will lead to a net reduction in total agricultural groundwater extraction across the region.

Statement: The agricultural authority's argument relies on the unstated assumption that farmers receiving the subsidies will not expand their total irrigated acreage using the water volume saved through drip irrigation.

To reduce long-term infrastructure expenses, the coastal transit authority of Metropolis plans to install continuous ultrasonic vibration sensors on the underwater concrete pillars of its main commuter bridges. Engineers argue that by detecting micro-fractures in real time, maintenance crews can perform minor localized patch repairs before major structural fatigue occurs, thereby significantly lowering total repair expenditures over the next decade.

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

To prevent soil degradation in arid farmland, agricultural researchers propose planting salt-tolerant halophytes alongside commercial crops. Halophytes absorb excess sodium ions from topsoil, which the researchers claim will allow commercial crops to absorb soil nitrogen more efficiently and thereby increase overall crop yields within two growing seasons.

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

A commercial airline plans to replace its current regional fleet with newer aircraft models that consume 25 percent less fuel per seat-mile, maintaining that this fleet transition will lower the airline's overall annual operating expenses. Consider the following assertion: 'Determining whether global jet fuel prices will rise or fall over the next five years represents a valid application of the Test of Variance to evaluate the argument's conclusion.' Is this assertion true or false?

A major software enterprise recently introduced a specialized cybersecurity training program for its third-party software vendors. The company's executive board claims that because vendors who voluntarily completed the training during its pilot phase experienced a 40 percent drop in data breach incidents compared to their pre-training levels, mandating the training for all remaining vendors will significantly reduce the enterprise's overall exposure to third-party data breaches.

Which of the following is an assumption on which the executive board's claim depends?

A municipal transit authority recently applied a new light-reflecting polymer coating to crosswalks across three high-density commercial districts. Over the subsequent twelve months, nighttime pedestrian accidents in these districts decreased by 25 percent compared to the previous year. The authority concluded that the enhanced visual contrast provided by the polymer coating was the primary factor in reducing nighttime pedestrian accidents. Which of the following would it be most useful to determine in evaluating the transit authority's conclusion?

Consider the following argument: A pharmaceutical research institute evaluated a novel antihypertensive drug by administering it to a cohort of patients over twelve weeks. The study recorded a statistically significant reduction in blood pressure in patients receiving the new drug compared to those receiving the standard treatment. Based on these findings, the lead researcher concluded that adopting the new drug in standard clinical practice will decrease the overall rate of major cardiovascular events among hypertensive patients. Evaluate whether the following claim represents an unstated assumption necessary to the researcher's argument:

'The researcher's conclusion relies on the unstated assumption that a statistically significant short-term reduction in blood pressure translates into a long-term reduction in overall major cardiovascular events.'

A major telecommunications company recently replaced traditional underground fiber-optic cables with low-Earth-orbit satellite connections for all its remote enterprise clients. Over the following year, customer satisfaction scores regarding connection stability among these remote clients rose by 40 percent. The company's executives concluded that satellite technology is inherently more reliable than underground physical infrastructure for serving remote geographic locations. Which of the following would it be most useful to establish in order to evaluate the executives' conclusion?

Over the past three years, the transit authority of a major metropolitan area instituted a policy requiring daily mechanical inspections of its bus fleet, whereas previously inspections occurred on a weekly basis. During this same three-year period, the average number of unscheduled service interruptions per bus decreased by 40 percent. The head of the transit authority concluded that conducting daily mechanical inspections was the primary cause of the reduction in unscheduled service interruptions and recommended that all municipal transit agencies adopt daily inspection schedules. Which of the following highlights the primary vulnerability in the reasoning of the head of the transit authority?

To reduce municipal water treatment expenses, Metro City's utility department plans to install bio-filters containing specialized bacterial strains in the main reservoir. Laboratory tests demonstrated that these bacteria rapidly break down microplastics, which currently clog standard filtration membranes at downstream treatment facilities. Department officials conclude that implementing these bio-filters will significantly decrease overall water treatment operating costs across the city. Which of the following, if true, most seriously weakens the utility department's conclusion?

Ecologists studying endangered forest elephants in a central African preserve recently introduced an automated acoustic monitoring network to track herd movements via low-frequency infrasound calls. The researchers hypothesized that installing these acoustic sensors at key waterholes would allow them to accurately estimate total elephant population trends across the preserve over time. However, skeptics argued that because elephants frequently travel between waterholes, acoustic detections at waterholes would lead to double-counting individual animals, thereby rendering population trend estimates unreliable.

Which of the following, if true, most strengthens the ecologists' argument?

To protect 14th-century sandstone monuments from winter freeze-thaw weathering, municipal heritage conservators plan to apply a hydrophobic silicone nanofilm across the exterior surfaces of all downtown stone structures. Laboratory tests confirm that the nanofilm prevents external rainwater from penetrating sandstone pores by up to 98 percent. The conservators conclude that applying this coating will significantly reduce the rate of structural cracking and surface spalling caused by freeze-thaw cycles over the next decade.

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

To combat urban air pollution, the municipal transit authority of a major city plans to replace its entire fleet of diesel buses with electric buses powered by lithium-iron-phosphate (LFP) batteries. Opponents of the plan argue that the frequent fast-charging required during peak operational hours will cause rapid battery degradation, forcing costly battery replacements within three years and rendering the transition economically unviable. However, transit officials maintain that the transition will substantially lower overall fleet maintenance costs over a ten-year period. Which of the following, if true, provides the strongest support for the transit officials' contention?

To decrease peak-hour patient wait times, a regional healthcare provider plans to launch an automated online triage system for its urgent care clinics. The system will evaluate walk-in patients upon arrival and redirect those with minor, non-emergency symptoms to scheduled telehealth consultations later the same day. Administrators reason that transferring a substantial portion of non-urgent visits away from physical clinics will alleviate waiting room overcrowding. Which of the following would be most useful to evaluate in determining whether the provider's plan will achieve its goal?