31. Read the arguments given below and answer the questions that follow.
Which of the given choices best completes the following passage?
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
Since an unsecured loan is more risky, from the lender’s point of view, than a loan backed by collateral, the fact that lenders receive higher interest rates for unsecured loans is an illustration of the principle outlined in the passage. Thus (b) is the best answer.
None of the other choices gives a clear instance in which increased risk is compensated by the potential for increased return. (a) does not concern to return on investment at all. (c) is an instance of low return unrelated to risk. In (d), contrary to the principle, the rate of return remains constant despite possible variations in risk.