Shrute Farms Corp. would like to have a WACC of 8.5%. The companys after-tax cost of debt is 4.6%, and its cost of equity is 12%. What debt to equity ratio (D/E) should the company maintain to achieve its target WACC?

Select one: a. 0.66 b. 0.90 c. 0.72 d. 0.77 e. 0.84