Shi Import-Exports balance sheet shows $300 million in debt, $50 million in preferred stock, and $250 million in total common equity. Shi's tax rate is 30%, rd=8%, rps=6.9%, and rcs=13%. If Shi has a target capital structure of 40% debt, 5% proffered stock, and 55% common stock, what is the WACC?

A. 9.74%

B. 8.79%

C. 10.70%

D. 9.99%