[求助]关于GWD6-Q33的结论和答案，请达人赐教

浅斟低唱

GWD6-Q33:

Crowding on Mooreville’s subway frequently leads to delays, because it is difficult for passengers to exit from the trains.  Subway ridership is projected to increase by 20 percent over the next 10 years.  The Metroville Transit Authority plans to increase the number of daily train trips by only 5 percent over the same period.  Officials predict that this increase is sufficient to ensure that the incidence of delays due to crowding does not increase.

Which of the following, if true, provides the strongest grounds for the officials’ prediction?

A.      By changing maintenance schedules, the Transit Authority can achieve the 5 percent increase in train trips without purchasing any new subway cars.

B.       The Transit Authority also plans a 5 percent increase in the number of bus trips on routes that connect to subways.

C.      For most commuters who use the subway system, there is no practical alternative public transportation available.

D.      Most of the projected increase in ridership is expected to occur in off-peak hours when trains are now sparsely used.

E.       The 5 percent increase in the number of train trips can be achieved without an equal increase in Transit Authority operational costs.

正确答案为：D

请问如何理解最后一句话和答案的关系呢？

看了一个解释

http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=214868&replyID=&skin=1

说：所以政府！说不够，减缓不了拥挤

我怎么觉得这个解释说反了呢？

我的理解是 政府预测这个增量足够保证拥挤不再增加了？

但是对答案还是不理解

请赐教~~

浅斟低唱

继续等待

浅斟低唱

sorry 找到了

题号不同

http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=72817&replyID=&skin=1