Which of the following statements is correct?

A. The WACC of a firm will increase as the corporate tax rate increases.

B. A company's weighted average cost of capital remains constant if the debt-equity ratio remains constant.

C. If a company uses its WACC as the discount rate for all of the projects it undertakes, then the company will tend to prefer lower risk projects over higher risk projects.

D. The discount rate assigned to an individual project should be based on the risks associated with that project