C is the right answer?

thank you

Which of the following statements is TRUE? A. For a project that requires an investment outlay today, and generates cash inflows in the future (i.e. CF, 0 for i > 1), the NPV is a decreasing function of the cost of capital. B. The IRR is a better measure for project appraisal than the NPV rule, because you do not need to know the project's required rate to make a decision. C. For mutually exclusive projects, choosing the project with the highest IRR will always lead to the optimal investment decision. D. None of statement A, B or C is true. E. All of statements A, B and C are true