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C is corrent. The requirement is to identify the limitation that is common to the calculations of payback period, discounted cash flow, internal rate of return, and net present value. They all rely on forecasts of future cash flows.
A is incorrect because the payback period, discounted cash flow, and net present value do not require multiple trial and error calculations.
B is incorrect because discounted cash flow, internal rate of return, and net present value all consider the time value of money.
D is incorrect because the payback period and the internal rate of return do not require knowledge of the company’s cost of capital.