In an Efficient Market, Which of the Following Is/are the Same

Multiple Choice

In an efficient market, which of the following is/are the same for all assets in the market?
I. The market risk premium.
II. The beta.
III. The reward-to-risk ratio.
IV. The risk-free rate.

A) I only
B) I and III only
C) II and IV only
D) I, III, and IV only
E) I, II, III, and IV