请问一道GMATPrep逻辑

flyawayaloe

A certain mayor has proposed a fee of five dollars per day on private vehicles entering the city, claiming that the fee will alleviate the city's traffic congestion. The mayor reasons that since the fee will exceed the cost of round trip bus fare from many nearby points, many people will switched from using their cars to using the bus.

which of the following statements if true, provides the best evidence that the mayor's reasoning is flawed?

A. Projected increases in the price of gas will increase the cost of taking a private veicle into the city.
B. The cost of parking fees already makes it considerably more expensive for most people to take a private vehicle into the city than to take a bus.
C. Most of the people currently riding the bus do not own private vehicles.
D. Many commuters opposing the mayor's plan have indicated that they would rather endure traffic congestion than pay a five-dollor-per-day fee.
E. During the average workday, private vehicles owned and operated by people living within the city account for 20%of the city's traffic congestion.

问哪个能证明mayor的逻辑毛病。答案是B. 我想不通。
mayor的逻辑是 提高开车进城的费用人们就会不开车而转坐公车进城，城市交通阻塞就会缓解。
他的逻辑毛病应该是即使提高费用，也不一定阻止大家开车进城。或者开车进城的人们不是造成交通阻塞的主要原因之类的吧。
B.是说停车费已经使开车进城比坐公交进城贵了。

eremitechow

mayor的推理是：因为私人交通工具进城的费用超过往返巴士的费用，人们就会选择坐公车而不是开车进城。

b.是说停车费已经是开车进城比坐公交进城贵了。

如果b为真，那么mayor推理的前提就不存在了，因为开车的费用在收取进城费之前（停车费）已经超过了坐公车的费用。

cosuede

而且，做逻辑不应该按照提干自己去推应该如何如何，应该按照非充分来考虑做题目，考虑选项。

参考一个官卫东的访谈

飞天猪piggy

今天刚做到这题

mayor推论的关键是大多人会因为价格而选择作bus

选项B恰否定了这一点 所以是最有力的削弱

Priscilla1996

B就说停车费已经远远超过了坐公交车的钱，所以证明开车的人对价格并不敏感，简单的来说就是不差钱，所以你变动价格并不会造成影响。

TCSH

b就是说开车本来就比坐公交贵，所以开车的人根本不care花多少钱