John is the manager of a portfolio with about 1000 stocks, and has paid close attention to ensure it is well diversified. For the next investment meeting he must estimate the return on his portfolio. He has determined that the portfolio standard deviation is 21%, and for the market the std dev is 18.8%. The expected market return is 12.38%, and the 13week treasury rate is 2.5%. If the firm uses CAPM for expected return, what will be the estimated return for John's portfolio? Oa 4.57 Ob 9.88 OC 13.54 Od cannot be estimated without the calculated beta O e 14.88