The relative market values of a company's sources of capital are 50% debt, 10% preferred stock, and 40% common stock. The company's current cost of preferred stock is 8%, common stock is 12%, and pre-tax cost of debt is 6.5%. The company has an income tax rate of 25%. What is the company's WACC? A. 8.04% B. 8.68% C. 8.85% D. 9.49%