Suppose project A has an IRR of 15% and Project B has an IRR of 21% and the company's WACC is 10%. The projects are mutually exclusive and there is no capital rationing.Which one of the following statements is true?

a) Neither Project A or B should be accepted.

b) Both projects should be accepted

c) We must know projects' NPV before determining which should be accepted.

d) Only project A should be accepted

e) Only project B should be accepted