Which of the following is not true?

A.) Geometric average is calculated using a different formula from the arithmetic average and is used for a different purpose.

B.) One can calculate the stocks risk premium by subtracting the firms rate of return with the risk-free rate.

C.) The type of efficient market hypothesis that is most often used to forecast stock prices is called the semi-strong form of the efficient market hypothesis.

D.) None of the above (all of the above are correct).