Explain solution reason please ty

Which of the following statements is incorrect? Select one: a. Other things equal, the IRR of a project remains the same when the WACC decreases. b. Other things equal, the MIRR of a project increases when the WACC increases. OC. Other things equal, the NPV of a project decreases when the WACC decreases. d. Other things equal, the payback period of a project remains the same when the WACC decreases. e. Other things equal, the discounted payback period of a project decreases when the WACC decreases