medium · GMAT Verbal
A city government observed that after it began offering free, city-wide public transit passes to all residents, the number of cars entering the downtown core during rush hour fell by 12% over the following year. Officials concluded that the free transit passes caused commuters to switch from driving to public transit.
Which of the following would be most important to determine in order to evaluate the officials' conclusion?
- Whether ridership on downtown transit routes rose by an amount consistent with the drop in car commuters.
- Whether residents in nearby suburban towns were also eligible to receive the free transit passes.
- Whether the city's public transit vehicles run on schedules that are convenient for most downtown workers.
- Whether the city has since decided to expand the free transit pass program to additional neighborhoods.
- Whether a majority of downtown workers surveyed said they would prefer to keep driving if given the choice.
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