请教一到逻辑题，各位XDJM请进

kevinh1217

. In the past most airline companies minimized aircraft weight to minimize fuel costs. The safest airline seats were heavy, and airlines equipped their planes with few of these seats. This year the seat that has sold best to airlines has been the safest one—a clear indication that airlines are assigning a higher priority to safe seating than to minimizing fuel costs.

　　Which of the following, if true, most seriously weakens the argument above?

　　(A) Last year’s best-selling airline seat was not the safest airline seat on the market.

　　(B) No airline company has announced that it would be making safe seating a higher priority this year.

　　(C) The price of fuel was higher this year than it had been in most of the years when the safest airline seats sold poorly.

　　(D) Because of increases in the cost of materials, all airline seats were more expensive to manufacture this year than in any previous year.(E)

　　(E) Because of technological innovations, the safest airline seat on the market this year weighed less than most other airline seats on the market.

   这道题为什么B不行？ 官方解释没看明白，求指点。。谢谢

kiwiya

我们要weaken的argument是：airlines are assigning a higher priority to safe seating than to minimizing fuel costs。所以我们应该有个预判，要说明航空公司没有把安全放在节省成本之前。
显然E说明了，航空公司是在保证了不耗费太多成本的情况下使用安全座椅，所以还是把省钱摆在第一。
B选项虽然不是无关，但削弱的程度不强。因为航空公司的转变并不是一定要announce，即使announce了也不能说明有转变，要用事实说话。

kevinh1217

刚开始看解释没明白，现在懂了，原文没有假设做了决定之前先要anounce，所以B 不行
谢谢