GLM Ltd is considering three mutually exclusive projects which have the following net present values and internal rates of return: Net present value Internal rate of return Project life Project A $2,000,000 20.0% Project B $2,500,000 18.0% 5 years Project C $2,900,000 20.0% 5 years 5 years If the firm uses a discount rate of 12% to evaluate its investment projects, what should the firm do and why