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Difficulty: MediumPassage Assumptions and Underlying Premises

Read the following passage carefully:

"To address worsening traffic congestion and deteriorating ambient air quality in rapidly expanding urban centers, municipal corporations have proposed reallocating existing curbside parking lanes toward dedicated, physically protected infrastructure for micro-mobility devices such as electric bicycles and stand-up scooters. Policy planners contend that establishing a safe, connected network of non-motorized lanes will encourage commuters to substitute private automobile travel with micro-mobility options for short-distance daily trips under five kilometers. Furthermore, municipal authorities intend to finance the ongoing maintenance and expansion of these micro-mobility corridors primarily through license fees levied on commercial dockless vehicle rental operators. By improving safety and dedicated access, municipal administrations project a significant reduction in overall private vehicular volume during peak commuting hours, thereby leading to measurable declines in localized urban carbon emissions and particulate matter concentration."

Which one of the following expresses the most crucial assumption on which the author's conclusion depends?

  1. Commuters currently relying on private motor vehicles for short-distance peak-hour trips are willing to switch to micro-mobility devices if safe, dedicated infrastructure is provided.Answer
  2. B
    Converting curbside parking spaces into dedicated micro-mobility corridors will increase the average commuting speed of long-distance automobile traffic across the metropolis.
  3. C
    Electric bicycles and scooters produce zero net lifecycle carbon emissions during their manufacturing and battery charging phases.
  4. D
    Private motor vehicle ownership must be completely banned in inner-city commercial districts to ensure the operational viability of micro-mobility lanes.

Answer

The conclusion relies on the assumption that commuters currently using private cars for short peak-hour trips are willing to adopt micro-mobility devices once safe lanes are made available.
The correct option identifies the necessary implicit premise linking the provision of safe micro-mobility lanes to the projected outcome of reduced private vehicular volume. If short-distance car drivers are unwilling to switch to e-bikes or scooters despite the presence of safe infrastructure, the proposed intervention will fail to reduce peak-hour automobile traffic. Under the negation test, denying this claim destroys the author's main conclusion.

Step-by-Step Solution

1
Identify the author's main conclusion and supporting premises.
The main conclusion is that establishing protected micro-mobility lanes will significantly reduce overall private vehicular volume during peak hours and lower localized urban emissions. The supporting premise is that safe lanes encourage micro-mobility substitution for short trips (<5 km).
Determining the core argument structure is essential before applying the assumption negation test.
2
Identify the logical gap between the premise (providing safe infrastructure) and the conclusion (achieving a significant reduction in peak-hour private car volume).
The argument assumes that safety/infrastructure is the decisive factor preventing short-distance drivers from switching, and that target commuters will actually choose to switch.
An assumption is an unstated bridge required to connect the premise directly to the outcome.
3
Apply the negation test to verify necessity.
Negating the statement gives: 'Commuters using private cars for short trips are NOT willing to switch to micro-mobility devices even if safe lanes exist.' If true, car volume will not fall, and the author's conclusion completely collapses.
A valid assumption must cause the main argument to break down when negated.

Key Concept

Passage Assumptions and Negation Test in Critical Reasoning
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Topics

Passage Assumptions and Underlying Premises

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