Which of the following statements about the role of the marginal cost of capital in determining the net present value of a project is most accurate The marginal cost of capital should be used to discount the cash flows:（）
A. if the firm’s capital structure is expected to change during the project’s life.
B. of all projects the firm is considering.
C. for potential projects that have a level of risk near that of the firm’s average project.
参考答案：C
解析：
Net present values of projects with the average risk for the firm should be determined using the firm’s marginal cost of capital. The discount rate should be adjusted for projects with above-average or below-average risk. Using the marginal cost of capital assumes the firm’s capital structure does not change over the life of the project. The appropriate discount rate does not depend on a project’s internal rate of return.