Calculate the required rate of return for the Wagner Assets Management Group, which holds 4 stocks. The market's required rate of return is 9.0%, the risk-free rate is 7.0%, and the Fund's assets are as follows: Stock Investment Beta 1.50 B -0.50 $200,000 300,000 500,000 1,000,000 1.25 D 0.75 Select the correct answer. a. 8.71% O b. 8.80% C. 8.44% d. 8.53% O e. 8.62%