Brown Street Grocers has a cost of equity of 11.75 percent, a pre-tax cost of debt of 5.75 percent, and a tax rate of 34 percent. What is the firm's weighted average cost of capital if the debt-value ratio is 23%?

a) 8.84%

b) 9.03%

c) 9.91%

d) 10.78%

e) 7.65%