First Solars long-term capital structure is 20% debt and 80% equity. The yield to maturity on the firms outstanding debt is 7.3% and the required return on equity is 14.7%. Given a tax rate of 28%, what is First Solars weighted average cost of capital?

A. 8.394%

B. 9.073%

C. 9.667%

D. 12.811%