Which of the following describes an advantage the internal rate of return has over net present value for capital budgeting purposes?

Select one:

a. The IRR method adjusts for the riskiness (or uncertainty) of the projected cash flows

b. Internal rate of return is an indicator of the efficiency, quality or yield of an investment.

c. The IRR method recognizes the firm's opportunity costs.

d. All of these answers.

-I said all of these answers and am confused as to why it is not.