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 tool 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.
Ans. (C)
我其實不是很理解這題是什麼意思? 雖然一變又一變的看過

但是這和題目要如何連結呢? 題目問說下列選項哪個如果正確的話可以作為machine-tool industry提出該issue的最好解釋? (C)的答案感覺上, 就只有在說明為什麼machine-tool industry要陳情. 那題目說那一大斷到底是要做啥用的哇?
以上麻煩各位大大解惑~~