i am stuck on this question

QRP Company can sell common shares at $30 per share and can obtain debt funding at 8 percent. It has a marginal income tax rate of 25 percent. The yield on US Treasury securities is 3 percent. The market risk premium is 6.0 percent, and the firm's beta is 0.9 . It has a targeted debt-to-equity ratio of 1:1. What is its cost of equity? A. 8,1 percent B. 8.4 percent C. 8.0 percent D. Insufficient information is provided to calculate this answer E. 5.7 percent