prep一道题不解 求帮忙解答 谢谢~

sogapink

15.   

Some airlines allegedly reduce fares on certain routes to a level at which they lose money, in order to drive competitors off those routes.  However, this method of eliminating competition cannot be profitable in the long run.  Once an airline successfully implements执行 this method, any attempt to recoup the earlier losses by charging high fares on that route for an extended period would only provide competitors with a better opportunity to undercut the airline's fares.

Which of the following, if true, most seriously weakens the argument?
降价赶走竞争者的方法不能长期盈利，因为想提价的时候会给竞争者更好的降价的机会

(A) In some countries it is not illegal for a company to drive away competitors by selling a product below cost.
(B) Airline executives generally believe that a company that once underpriced its fares to drive away competitors is very likely to do so again if new competitors emerge.
(C) As part of promotions designed to attract new customers, airlines sometimes reduce their ticket prices to below an economically sustainable level.
(D) On deciding to stop serving particular routes, most airlines shift resources to other routes rather than reduce the size of their operations.
(E) When airlines dramatically reduce their fares on a particular route, the total number of air passengers on that route increases greatly.

为什么是B呢 是什么意思呢？

hjbb1027

其实这道题正确选项也有不完美的地方，Airline executives generally believe有诉诸权威的缺陷，但是对比其他选项只有它了。

sogapink

谢谢谢谢啦~！

hjbb1027

就是这个意思哦

sogapink

是说因为它可以在此降价 所以提供给竞争者降价机会的说法就不成立了 是么~

hjbb1027

A) some country以偏概全，无关
B) 这些公司可以再次降价，驱除新的竞争者，所以this method...would only provide competitors with a better opportunity to undercut the airline's fares就不成立了。