Which of the following statements is most correct?

	A.	a. The rate of depreciation will often affect operating cash flows, even though depreciation is not a cash expense.
	B.	b. Corporations should fully account for sunk costs when making investment decisions.
	C.	c. Corporations should fully account for opportunity costs when making investment decisions.
	D.	d. All of the answers above are correct.
	E.	e. Answers a and c are correct.