Which One of the Following Statements Is Correct

Which one of the following statements is correct?

A) The internal rate of return is the most reliable method of analysis for any type of investment decision.
B) The payback method is biased toward short-term projects.
C) The modified internal rate of return is most useful when projects are mutually exclusive.
D) The average accounting return is the most difficult method of analysis to compute.
E) The net present value method is applicable only if a project has conventional cash flows.