medium · GMAT Verbal
Argument: A city council recently replaced its diesel bus fleet with electric buses to improve local air quality. The council concluded that because electric buses produce zero emissions at the point of use, the city's overall air pollution levels will significantly decrease.
Which of the following is an assumption required by the council's argument?
- The new electric buses were manufactured at a factory located outside the city.
- Pollution from generating the buses' charging electricity will not enter the city's air in amounts sufficient to offset the diesel emissions eliminated by the switch.
- Residents of the city will increase their routine use of public transportation now that the buses are quieter and cleaner than the diesel models they replaced, amplifying any air-quality gains from the fleet switch.
- The city's bus fleet was the primary source of all local air pollution prior to the switch.
- Electric buses are less expensive to maintain over their lifespan than the diesel buses they replaced.
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