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 1.20. What is the required rate of return on the investor's portfolio? Stock Required return rRF rM Beta Weight A 9% B Select one:

a. 10.15% b. 9.0% c. 9.65% d. 10.75% e. 6.8%