一道“解释题”，麻烦大家指点一二～～

orange09

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 explanationof 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 Defence Department is only marginally concerned with the effects of foreign cpmpetition on the machine-tool industry.
C. The machine-tool industry encountered difficulty in obtaining government protection against imports on grounds other than defence.
D. A few weapons important for defence consist of parts that do not require extensive machining.
E. Several federal government programs have been designed which will enable domestic machine-tool manufacturing firmsto compete successfully with foreign toomakers.

疑问有二：
1、如果用排除法的话可以看出答案是C，但是如果按正常的思路去想的话就不是太明白选C的原因所在；
2、我记得老师说过除了题目中的范围足够大不然选项中不会出现other than 的。。。

谢谢大家了~~

sdcar2010

Your teacher needs to open his or her eyes. Other than = except for, can be used in logical reasoning questions to define the scope of the argument.