单选题 Automobile exhaust is a serious pollution problem in Riverside, and instituting tolls at Riverside's bridges would reduce the total number of miles traveled by automobiles. Nevertheless, overall pollution levels would not decrease because there would be long lines at the toll booths, and automobiles expel more exhaust per minute while idling than in any other driving situation.
The argument above depends on which of the following assumptions?

A、 Any reduction in automobile exhaust resulting from a reduction in the miles traveled by cars would be matched or surpassed by the additional exhaust resulting from toll lines.
B、 Cars in Riverside spend more time, on average, idling than they do in other driving situations.
C、 Increasing automobile exhaust at the bridges will not significantly affect air pollution because few drivers use the bridges in Riverside frequently.
D、 Reducing automobile exhaust is not the most effective way of reducing air pollution.
E、 (E) The inconvenience of idling in the long toll lines at Riverside's bridges wilt cause most drivers to change their driving routes, not the amount of driving that they do.

【正确答案】 A

【答案解析】