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题目材料：
Mayor: Vehicle exhaust produces dangerously high ozone levels in our city in hot, humid weather. As an incentive for people to commute by bus rather than by car, special free commuter buses will be scheduled on hot, humid days. Since a bus can carry about 40 people but produces only about 20 times as much exhaust as a car, ozone levels will be lower as long as the buses are more than half full.
Which of the following, if true, most seriously weakens the argument?
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A.Most of the people who would take the special free buses are currently members of carpools.
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B.The city does not currently have enough buses to transport all of the commuters who normally commute by car.
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C.Buses that would be operating on hot, humid days would rarely, if ever, be filled to capacity.
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D.The amount of vehicle exhaust produced in the city is not significantly higher on hot, humid days.
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E.Not all commuter routes are used by enough people to warrant providing bus service for them.
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