Mullineaux Corporation has a target capital structure of 35 percent common stock, 15 percent preferred stock, and 50 percent debt. Its cost of equity is 10 percent, the cost of preferred stock is 6 percent, and the pre-tax cost of debt is 8 percent. What is the firri's WACC given a tax rate of 30 percent? A. 7.2% B. 7.3\% c. 7.4% D. 7.5% E. 7.6%