Company A has a beta of 0.90, while Company B's beta is 1.70. 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. 7.200%

b. 3.600%

c. 5.400%

d. 8.325%

e. 11.025%