13. State officials report that soaring rates of liability insurance have risen to force cutbacks in the opera­tions of everything from local governments and school districts to day-care centers and recreational facilities.

(A) rates of liability insurance have risen to force

(B) rates of liability insurance are a force for

(C) rates for liability insurance are forcing

(D) rises in liability insurance rates are forcing

(E) liability insurance rates have risen to force

答案C, 解释：

In choices A and B, rates of is incorrect; when rates means "prices charged," it should be followed by for. Also in B, are a force for does not accurately convey the meaning that the soaring rates are actually forcing cutbacks in the present. In A and E, it is redundant to say that soaring rates have risen. Similarly, the word rises makes D redundant. C, the best choice, is idiomatic and concise, and it correctly uses the progressive verb form are forcing to indicate an ongoing situation.

我的问题是：如果B选项改为 rates for liability insurance are a force for 是否正确？ 如果不正确是否是因为“动词优于名词”的原则？