Which of the Following Statements Is CORRECT

Which of the following statements is CORRECT?

A) Since debt financing raises the firm's financial risk, increasing a company's debt ratio will always increase its WACC.
B) Since debt financing is cheaper than equity financing, raising a company's debt ratio will always reduce its WACC.
C) Increasing a company's debt ratio will typically reduce the marginal cost of both debt and equity financing.However, this action still may raise the company's WACC.
D) Increasing a company's debt ratio will typically increase the marginal cost of both debt and equity financing.However, this action still may lower the company's WACC.
E) Since a firm's beta coefficient it not affected by its use of financial leverage, leverage does not affect the cost of equity.