The correct option is b. a rational firm will not take out a loan for the investment.
The rate of return (RoR) is indeed the net gain or loss of the an investment over a given time period represented as a proportion of the initial cost of the investment.
Some key features of the rate of return are-
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The complete question is-
If the interest rate on a loan is higher than the expected return from an investment:
a. the Federal Reserve will conduct expansionary monetary policy.
b. a rational firm will not take out a loan for the investment.
c. the Federal Reserve will conduct contractionary monetary policy.
d. the government will conduct expansionary fiscal policy.
e. a rational firm will take out a loan for the investment.