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.


Can some one please explain the correct answer. I am having difficulty understanding the argument itself.