题目选项分析

Which of the following best completes the passage below?

The more worried investors are about losing their money, the more they will demand a high potential return on their investment:great risks must be offset by the chance of great rewards.This principle is the fundamental one in determining interest rates, and it is illustrated by the fact that ________ .

【选项】at any one time, a commercial bank will have a single rate of interest that it will expect all of its individual borrowers to pay