Down Bedding Has an Unlevered Cost of Capital of 13

Down Bedding has an unlevered cost of capital of 13 percent, a cost of debt of 7.8 percent, and a tax rate of 32 percent. What is the target debt-equity ratio if the targeted cost of equity is 15.51 percent?

A) .63
B) .68
C) .71
D) .76
E) .84