The common stock of Detroit Engines has a beta of 1.34 and a standard deviation of 11.4 percent. The market rate of return is 11.5 percent and the risk-free rate is 4 percent. What is the firm's cost of equity?
A. 10.05 percent
B. 12.98 percent
C. 14.05 percent
D. 15.50 percent
E. 15.67 percent