Question 4 Not yet answered Marked out of 1.00 Flag question The principle of risk-return tradeoff means that Select one: a. higher risk investments must earn higher returns b. an investor who bought stock in a small corporation five years ago has more money than an investor who bought U.S. Treasury bonds five years ago c. a rational investor will only take on higher risk if he expects a higher return d. an investor who takes more risk will earn a higher return