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 manufacturing of the new electric buses did not release more pollution into the city's air than the manufacturing of diesel buses would have.
- The electricity used to charge the new buses is not generated primarily by coal-fired power plants outside the city limits.
- Residents will increase their use of public transportation now that the buses are quieter and cleaner.
- 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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