[单选题]
Given the following information on a company's capital structure, what is the company's weighted average cost of capital? The marginal tax rate is 40%.
Type of capital Percent of capital structure Before-tax component cost
Bonds 40% 7.5%
Preferred stock 5% 11%
Common stock 55% 15%
A.10.0%.
B.10.6%.
C.11.8%.