For a stock to be in equilibriumthat is, for there to be no long-term pressure for its price to changethe

a. expected return must be equal to both the required future return and the past realized return.

b. expected future return must be less than the most recent past realized return.

c. expected future return must be equal to the required return.

d. past realized return must be equal to the expected return during the same period.

e. required return must equal the realized return in all periods.