This sentence has three problems. First, "Rising rates ... are rising" is redundant. Second, the proper construction is "rates for health insurance" or "health insurance rates," not "rates of health insurance." The phrase "rates of health insurance" implies that the author is concerned with the number of occurrences of health insurance, but the actual concern is with the cost of (or "rates for") health insurance. Finally, the phrase "to force" implies that the rates are rising specifically for the purpose of forcing cutbacks. That is an illogical statement. Look for an answer choice that corrects all three errors.

A vertical scan shows that, in addition to (A), (B) can be eliminated because of "rates of health insurance." Also, (E) uses "to force" at the end, retaining the same illogical meaning as the original. Eliminate (E) as well. Read (C) and (D) carefully.

(D) is redundant because now the sentence begins "Rising increases."

(C) fixes all three problems without introducing new problems. Note that in this question, it could be argued that the best construction, "rising health insurance rates," is not one of the options. Don't let this fact slow you down. Remember to work with what you're given on Sentence Correction and choose the answer choice that doesn't commit errors and, if more than one choice is error-free, is the most active and concise.