which one of the following is the best definition of the term "expected return" as it applies to the concept of risk and returns

a. the guaranteed return on a short-term treasury security which will be earned in the future

b. the difference between the expected return on a risky asset and the current return on a risk-free asset

c. the return on a risky asset which is expected in the future.

d.the certain return on a risk-free asset which is going to be earn in the future

e. the difference between the expected return on a risky asset and the expected rate of inflation