Critical Reasoning

A study of high-growth technology startups established over the past decade revealed that every company that achieved a valuation exceeding one billion dollars was co-founded by an executive with prior experience in enterprise software. Based on this finding, a venture capital analyst argued that in order to ensure a newly launched biotechnology startup achieves a billion-dollar valuation, the founding team must simply hire a former enterprise software executive.

Which of the following best describes the flaw in the venture capital analyst's reasoning?

A historian studying medieval trade notes that during the mid-fourteenth century, merchants in several Mediterranean port cities rapidly shifted from single-entry accounting to complex double-entry bookkeeping. The historian concludes that this shift was caused primarily by the regional introduction of inexpensive rag-based paper, which made maintaining voluminous ledger books financially viable for average merchant houses. Which of the following statements represent necessary unstated assumptions upon which the historian's argument depends? Select all that apply.

Researchers studying spatial cognition observed that laboratory rats trained to navigate a complex maze exhibited a significant increase in slow-wave neural activity during subsequent sleep compared to control rats that spent an equal duration exploring an open, non-navigational field. Concluding that slow-wave sleep specifically functions to consolidate newly acquired spatial maps rather than serving as general neural recovery from physical exertion, the researchers posited that this elevated slow-wave activity is directly driven by spatial learning.

Which of the following are assumptions upon which the argument depends? Select all that apply.

Dendrochronological analysis of oak panels used by seventeenth-century Dutch master painters demonstrates that all timber imported from the Baltic region between 1620 and 1650 was derived from slow-growing old-growth trees. Oak felled in the Baltic during these three decades consistently exhibits narrow growth rings containing high structural density. Panels crafted from this Baltic oak resist warping significantly better than panels made from domestic Dutch oak. Historical records confirm that Rembrandt van Rijn painted exclusively on wooden panels made from Baltic oak between 1630 and 1645. However, after 1645, trade blockades completely halted Baltic timber shipments to Amsterdam for over ten years.

If the statements above are true, which of the following must also be true on the basis of them?

In 2021, the government of a maritime nation introduced strict environmental regulations requiring all commercial freight vessels operating within its territorial waters to reduce their sulfur dioxide emissions per nautical mile traveled by at least 40 percent. Official compliance audits confirmed that every commercial freight company operating in the region fully implemented the required engine retrofits and fuel specifications within the designated timeline. Surprisingly, however, coastal atmospheric monitoring stations recorded a 15 percent net increase in total annual sulfur dioxide emissions generated by commercial freight vessels in these waters over the four years following the regulation's implementation.

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

To curb economic losses from bark beetle infestations, timber managers introduced a predatory beetle species that preys exclusively on adult bark beetles during their early spring mating period. Researchers concluded that this biological control measure will significantly increase timber yields over the coming decade. They reason that suppressing adult bark beetle numbers during early spring will prevent the beetles from boring into mature trees and depositing larvae, which cause extensive structural damage to wood tissue. Which of the following, if true, most seriously weakens the researchers' argument?

Agricultural researchers recently introduced a specialized bio-inoculant containing the fungal strain *Glomus intraradices-X*, designed to bolster root absorption in wheat crops during dry spells. In controlled trials conducted across several arid testing plots, wheat fields treated with the bio-inoculant produced a 25 percent higher grain yield than untreated control plots during a severe seasonal drought. Based on these results, the researchers concluded that widespread adoption of *Glomus intraradices-X* in commercial wheat farming will effectively mitigate crop yield losses caused by future severe droughts.

Which of the following statements represent unstated assumptions upon which the researchers' argument depends? Select all that apply.

A team of urban planning researchers observed that city neighborhoods that instituted mandatory minimum green space quotas ten years ago currently report significantly lower average ambient noise pollution levels than adjacent neighborhoods without such mandates. The researchers concluded that establishing mandatory green space minimums is an effective urban planning policy for directly dampening urban noise pollution in residential districts.

Which of the following is an assumption upon which the researchers' argument relies?

Urban planners frequently advocate for the installation of green roofs—vegetated layer structures built over rooftops—citing their capacity to lower urban ambient temperatures and manage stormwater runoff. However, recent longitudinal studies comparing municipal infrastructure budgets across thirty mid-sized cities demonstrate that the cumulative maintenance costs of public green roofs over a fifteen-year period substantially exceed the financial savings realized from reduced energy consumption and water management. Consequently, municipalities seeking cost-effective environmental remediation should prioritize expanding ground-level urban canopy cover rather than retrofitting existing municipal structures with green roofs.

Which of the following best expresses the main conclusion of the argument above?

To control the invasive crown-of-thorns starfish population damaging a coastal barrier reef, marine biologists introduced a species of predatory snail that feeds exclusively on juvenile starfish. Five years after the introduction, surveys recorded a marked increase in healthy coral coverage across the reef. The biologists concluded that the predatory snails successfully suppressed the starfish population, thereby enabling the coral reef to recover.

Which of the following is an assumption on which the marine biologists' argument depends?

To combat severe water scarcity, a regional agricultural board recommends that local apple orchard operators replace conventional overhead sprinklers with micro-drip irrigation systems. The board asserts that because micro-drip systems deliver water directly to plant root zones with minimal evaporation loss, implementing this transition across all regional orchards will significantly reduce the total volume of water consumed by the region's agricultural sector. Which of the following is an assumption upon which the agricultural board's argument depends?

While traditional economists contend that implementing stringent tariffs on imported raw materials inevitably safeguards domestic manufacturing employment during global market downturns, empirical evidence from mid-twentieth-century industrial shifts demonstrates a strikingly counterintuitive pattern. When raw material import costs rose due to protective duties, manufacturers were forced to economize by automating production lines far more rapidly than they would have under standard market conditions. Consequently, rather than preserving manual positions, trade restrictions inadvertently accelerated the displacement of industrial labor through capital-intensive technological adoption. Therefore, modern policymakers attempting to arrest employment declines in domestic manufacturing by elevating tariffs on essential imported inputs will ultimately catalyze the very structural job losses they intend to forestall.

Which of the following most accurately states the main conclusion of the argument?

A municipal power authority introduced automated smart meters across residential districts to detect voltage anomalies and isolate localized power outages automatically. During the six months following installation, the total duration of power outages experienced by residents in these districts decreased by 35 percent compared to the same period in previous years. Municipal officials concluded that the automatic anomaly detection of the smart meters was directly responsible for reducing outage durations.

Which of the following, if true, provides the strongest support for the municipal officials' conclusion?

A marine biotechnology firm plans to use thermozyme-X, an enzyme extracted from deep-sea hydrothermal vent archaea, to accelerate industrial plastic recycling. In laboratory tests, thermozyme-X completely degraded unsorted polyolefin plastics at temperatures above 80°C within six hours. The firm concludes that deploying thermozyme-X in commercial recycling facilities will significantly lower overall operational costs compared to conventional sorting and mechanical recycling processes.

Which of the following are assumptions upon which the marine biotechnology firm's argument depends? Select all that apply.

To reduce operational costs and improve network reliability, a telecommunications provider plans to replace all existing copper wire infrastructure in rural districts with fiber-optic cables over the next two years. Corporate executives argue that this upgrade will significantly boost net operating profits from rural service within three years, noting that fiber-optic infrastructure requires 70 percent less routine maintenance than copper and supports higher bandwidth subscriptions. Consequently, the executives conclude that the initial capital expenditure will be quickly offset by reduced maintenance expenses and increased subscription revenues.

Which of the following statements, if true, most seriously weakens the corporate executives' argument?

A logistics company recently provided ergonomic mechanical keyboards to all data-entry clerks at its main fulfillment facility, while clerks at its secondary facility continued using standard keyboards. Over the following six months, reported cases of repetitive wrist strain at the main facility dropped by 40 percent compared to the previous year, whereas reported cases at the secondary facility remained unchanged. Management concluded that replacing standard keyboards with ergonomic mechanical keyboards was responsible for the reduction in wrist strain injuries. Which of the following, if true, most seriously weakens the management's argument?

A municipal public transit agency recently installed high-definition security cameras in all city buses to decrease instances of vandalism. Following the installation, reported cases of vandalism aboard buses dropped by forty percent over a six-month period. Consequently, transit officials concluded that the visible presence of the new cameras successfully deterred potential vandals from committing crimes on the buses.

Which of the following statements, if true, provides the strongest support for the transit officials' conclusion?

Recent lead isotope analyses of lead ingots recovered from third-century BCE Mediterranean shipwrecks have challenged long-standing assumptions regarding Roman mineral procurement. Historically, economic historians posited that Iberian mines supplied virtually all industrial lead used across the central Republic. However, isotopic signatures from newly analyzed cargo off Sardinia match galena deposits in the Aegean rather than Hispania. Furthermore, processing marks on these ingots indicate standardized refining techniques unique to Attic smelting facilities. Although Iberian mining undeniably expanded during the Punic Wars, these maritime artifacts prove that eastern Mediterranean trade networks remained fundamental suppliers of heavy metals during the middle Republic. Consequently, scholars must revise models that treat western Mediterranean conquest as the sole catalyst for Roman industrial resource acquisition.

Based on the passage, which of the following statements represent main claims or central conclusions supported by the author's argument? Select all that apply.

To reduce emergency room overcrowding, a city's health department opened several free outpatient clinics in low-income neighborhoods. Six months later, emergency room visits among low-income residents had increased by 12 percent. Consequently, municipal auditors concluded that the clinic program failed to reduce emergency room usage. Health administrators maintain, however, that the program is effectively accomplishing its intended goal.

Which of the following, if true, provides the strongest support for the health administrators' position?

A recent urban planning study analyzed twenty metropolitan areas and observed that cities with a high density of public parks reported significantly lower average stress levels among residents than did cities with fewer public parks. The study's authors concluded that expanding green spaces within urban centers directly improves the psychological well-being of city residents. Consequently, municipal leaders in City X plan to convert several commercial districts into public parks in order to reduce resident stress levels.

Which of the following best describes the flaw in the argument's reasoning?