Which of the following statements is true when there is only one scarce resource?

	A.	Choose the product that gives the largest contribution per unit of the scarce resource used.
	B.	Choose the product that gives the largest contribution per unit of all of the resources used.
	C.	Choose the product that gives the smallest contribution per unit of all of the resources used.
	D.	Choose the product that gives the smallest contribution per unit of the scarce resource used.