Which of the following is NOT an inventoriable cost at Big Bobs Automotive Production Plant?

	A.	Steel used to make the cars.
	B.	Salary paid to the plant supervisor Sal who oversees the production of cars.
	C.	Wages paid to the assembly line workers who help make the cars.
	D.	Depreciation on the office building where the accounting for Big Bobs Automotive Production Plant is done.