计划措施类题目OG做法有些不明白

alicejingli

Since the deregulation of airlines, delays at the nation's increasingly busy airports have increased by 25 percent. To combat this problem, more of the takeoff and landing slots at the busiest airports must be allocated to commercial airlines.
Which of the following, if true, casts the most doubt on the effectiveness of the solution proposed above?
(A) The major causes of delays at the nation's busiest airports are bad weather and overtaxed air traffic control equipment.
(B) Since airline deregulation began, the number of airplanes in operation has increased by 25 percent.
(C) Over 60 percent of the takeoff and landing slots at the nation's busiest airports are reserved for commercial airlines.
(D) After a small midwestern airport doubled its allocation of takeoff and landing slots, the number of delays that were reported decreased by 50 percent.
(E) Since deregulation the average length of delay at the nation's busiest airports has doubled.

这道题，恩，会了，但是现在回想有一个概念，学过XDF的朋友也请帮忙看看，就是这个题目属于计划类的削弱，方法是肯定计划否定目的，我的问题来了。。
A是正确的，但是你没觉得A是否定了计划吗？因为导致delays的原因是 天气等。那按道理说原文给的这个计划就应该实行不了，但是这个A选项居然还对了。所以，是说，做计划类题目，不用管计划是否可行，只要让目的达不到就可以吗？
求解。
证实我的想法是否正确

sdcar2010

Choice A casts the most doubt on, not supports the proposal.

alicejingli

？我知道，但是我还是有问题如上

sdcar2010

计划类的削弱，方法是肯定计划否定目的??

Bulls_ _t!

alicejingli

对呀，回楼上的，难道不是？？？我一直都是这样做的，老高不是这么讲的？