Use the information to answer the following questions. Assume the yield curve is flat and the T-bill rate is 5%. The market return rate is 10%. The required rate of return for Stock A is 9%. An investor is forming a portfolio by investing $50,000 in stock A and $25,000 in stock B. Stock B has a beta of 1.50. What is the required rate of return on the investor's portfolio? Stock Required return IRF A 9% B Select one: a. 10.00% b. 9.0% O c. 10.15% O d. 6.8% O e. 10.75%