The Jackson Company just paid a dividend equal to $3.00 per share on its common stock, and it expects this dividend to grow by 7 percent per year indefinitely. The firm has a beta coefficient equal to 1.50, the risk-free rate is 10 percent, and the expected return on the market is 14 percent. According to the capital asset pricing model, what is Jackson's cost of retained earnings, r7 O a. 23% O b. 21% Oc7% d. 11% 16%