请问GWD2-15 逻辑 关于假设

fly100

Q15:
The city of Workney, in raising bus fares from $1.00 to $1.25, proposed that 18 fare tokens be sold for $20.00 to alleviate the extra burden of the fare increase on the city’s low-income residents.  Critics suggested alternatively that 9 fare tokens be sold for $10.00, because a $20.00 outlay would be prohibitive for low-income riders.

The alternative proposal depends on which of the following assumptions?

A.    Low-income residents of Workney will continue to ride the buses in the same numbers despite the fare increase.
B.    Low-income riders would be more likely to take advantage of the savings afforded by the 9-token offer than would other riders.
C.    The outlay of $10.00 for the purchase of 9 fare tokens would not be prohibitive for low-income bus riders.
D.    The proposed fare increase is needed for the purchase of new buses for the city’s bus system.
E.    Buses provide the only means of public transportation in the city of Workney.

正确答案是C, 为什么不是A或B呢? 没有搜索到这题,请各位大侠指点!

wxq19881113

Critics suggested alternatively that 9 fare tokens be sold for $10.00, because a $20.00 outlay would be prohibitive for low-income riders.这句话是说C的假设是价格高了，Low income的人不回去买。但是他们怎么知道10块钱是不是一个高价格呢？楼主可以用取非削弱的办法，C取非的意思是，low income的人排斥10块钱的票，那么结论就被削弱了。所一选C