请教GMAT逻辑大全（不含OG版）TestII的第１５题

In the effort to fire a Civil Service employee, his or her manager may have to spend up to $100,000 of tax money. Since Civil Service employees know how hard it is to fire them, they tend to loaf. This explains in large part why the government is so inefficient.
It can be properly inferred on the basis of the statements above that the author believes which of the following?
I.     Too much job security can have a negative influence on workers.
II.     More government workers should be fired.
III.    Most government workers are Civil Service employees.
(A) I only
(B) I and III only
(C) II only
(D) I, II, and III
(E) III only

最怕做这种inferred类型的题目了。答案是A，但是我觉得II选项也是可推出的呀？