Q9. Which one of the following statements is correct concerning the weighted average cost of capital (WACC)? A. The WACC may decrease as a firm's debt-equity ratio increases B. When computing the WACC, the weight assigned to the preferred stock is based on the coupon rate multiplied by the par value of the stock C. A firm's WACC will decrease as the corporate tax rate decreases D. The WACC will remain constant unless a firm retires some of its debt (1 mark)