Which of the Following Statements Is True About Relevant Cash

Which of the following statements is true about relevant cash flows?

A) Day-to-day operating cash flows of a project are relevant cash flows.
B) Inflation during the project's lifetime is a relevant cash flow.
C) Depreciation expenses not relevant cash flows to be considered in the cash flow of a project.
D) Sunk costs of engineering study to determine the feasibility of a project are relevant cash flows.
E) Opportunity cost of land being used for the project that the firm already owns is a relevant cash flow.