题目选项分析

When interest rates are high, insurance companies reduce the premiums they charge for many kinds of insurance policies. The reason is that insurance companies want to take in as much money as possible in premiums so that they can invest the money at high rates of interest. And premium reductions help achieve this objective, since __________.

Which of the following most logically completes the argument below?

【选项】insurance companies can sell many more insurance policies if they charge lower premiums than they would if they left premiums unchanged