一道Explanation题

13. Defense department analysts worry that the ability of the United States to wage a prolonged war would be seriously endangered if the machine-tool manufacturing base shrinks further. Before the Defense Department publicly connected this security issue with the import quota issue, however, the machine-tool industry raised the national security issue in its petition for import quotas.

Which of the following, if true, contributes most to an explanation of the machine-tool industry’s raising the issue above regarding national security?

A. When the aircraft industries retooled, they provided a large amount of work for too builders.

B. The Defense Department is only marginally concerned with the effects of foreign competition on the machine-tool industry.

C. The machine-tool industry encountered difficulty in obtaining governmental protection against imports on grounds other than defense.

D. A few weapons important for defense consist of parts that do not require extensive machining.
                

E. Several federal government programs have been designed which will enable domestic machine-tool manufacturing firms to compete successfully with foreign toolmakers.

答案C。看着不难，但是感觉找不到答题思路，不知道从原文怎么得出C的。只是觉得C比其他答案好。

请帮忙分析一下这道题的思路。

答案C，这道题看着简单，但是找不到答题思路，请帮忙分析一下这道题的思路。

explaination 题给我的整体感觉就是：答案五花八门 光怪陆离 初看之下不着边际的解释反而是正确答案（这点跟推理题完全相反）

这道题的背景是：Defense department的analysts担心战争不能持续因为machine-tool manufacturing出问题。当Defense department将两个问题（security issue、import quota issue）放在一起考虑时machine-tool industry就按奈不住了 可能是政府进口的想法损害了machine-tool industry的利益  只有C选项声明了这点（得不到保护，别管在哪个领域的保护，这也是非充分性的体现）

A侧面说明利益有保障

B关心国外的竞争并未说明自己就一定利益受损

D扯太远了

E直接说明其利益有保障

所以解释题的最高原则是：方向对了 沾边就算

（因为造成一件事的原因太多了作为一个管理者应该保证方向正确而不是绝对有效 无效想可以修改 方向错了就完了 想伯南克在最短的时间内推出救助方案获得一致赞赏，即便后来承认了方案的无效性）

祝好运！

按og思路过一遍

读题，国防部有人担心国内工业缩水导致将来干不过其他国家。但是早在国防部有这想法之前，国内工业就给国会申请过进口补助，（原因同国防部）。

问题：下面哪个能解释为什么国内工业因为xx要提这要求？

c，因为进口货搞得他们没钱赚