5月机经的问题

5.A recent poll found that over 80 percent of the residents of Nalmed Province favored a massive expansion of the commuter rail system as a means of significantly easing congestion on the province's highways and were willing to help pay for the expansion through an increase in their taxes. nevertheless, the poll results indicate that expansion of the rail system, if sucessfully completed, would be unlikely to achieve its goal of easing congestion, because______
A. most people in favor of expanding the rail system reported less congestion during their highway commute as the primary benefit they would experience
B of the less than 20 percent of residents not counted as favoring the expansion, about half claimed to have no opinion one way or the other
C the twice-daily periods of peak congestion caused by people commuting in cars have grown from about an hour each to almost two and a half hours each in the past 20 years
D expanding the commuter rail system will require the construction of dozens of miles of new railbed
E the proposed expansion to commuter rail system will make it possible for some people who both live and work at suurban locations to commute by rail.。(05/28/2004)

请问这题的答案是a 还是 e ??

I vote for A. The reason roots from the report in A that suggests that most of the people will not commute by rail.

不好意思，我不太懂耶，那些人把reported less congestion during their highway commute as the primary benefit they would experience，为什么会导致计划不成功，如果most of the people will not commute by rail.，那不就导致计划成功了吗？