Company A has a beta of 0.70, while Company B's beta is 1.45. The required return on the stock market is 9.00%, and the risk-free rate is 2.25%. What is the difference between A's and B's required rates of return? (Hint: First find the market risk premium, then find the required returns on the stocks.) Do not round your intermediate calculations. a. 4.30% b. 4.71% c. 4.25% d. 5.01% e. 5.06%