Central Systems, Inc. desires a weighted average cost of capital of 9 percent. The firm has an after-tax cost of debt of 5 percent and a cost of equity of 12 percent. What debt-equity ratio is needed for the firm to achieve its targeted weighted average cost of capital?
A. 0.75
B. 0.58
C. 0.92
D. 0.65
E. 0.85