In evaluating the argument, it would be most useful to know the answer to which of the following questions?
For each terminal, what proportion of passengers using that terminal are transit passengers, who merely change flights at the airport?
Understanding the proportion of transit passengers at each terminal is crucial because it directly impacts the effectiveness of the new rail line in reducing road congestion. If a significant number of passengers at the East Terminal are merely changing flights, they may not contribute to road congestion, thus questioning the assumption that serving the East Terminal maximally reduces congestion.
This question directly addresses the argument's assumption that all passengers contribute to congestion. By identifying the proportion of transit passengers, city officials can better evaluate the actual impact of the new rail line on road congestion, allowing for a more informed decision.
While the number of airlines may indicate passenger volume, it does not directly relate to the congestion issue. Knowing the number of airlines alone does not address whether serving the East Terminal will effectively reduce road congestion, making this question less relevant to the argument.
Cost considerations are important, but this question does not evaluate the effectiveness of reducing congestion. The argument focuses on passenger distribution, so cost differences do not directly impact the main concern of alleviating congestion.
The average number of passengers per flight does not specifically address the congestion issue caused by passenger volume at terminals. This question may provide some insight into terminal usage, but it is not as crucial as understanding the transit passenger proportion.
While alternative measures could be considered, this question shifts focus away from evaluating the proposed rail line's impact. The argument is centered on whether bringing the line to the East Terminal will help reduce congestion, making this question less pertinent.
To evaluate the argument effectively, determining the proportion of transit passengers at each terminal is essential. This information directly informs the decision on whether building the rail line to the East Terminal would significantly reduce road congestion. Other questions, while relevant in different contexts, do not address the core assumption of the argument regarding passenger behavior and congestion impact.
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