The controller of Gutierrez Industries has collected the following monthly expense data for use in analyzing the cost behaviour of maintenance costs:

Month		Total Maintenance Costs			Total Machine Hours
January		$2,750			3,500
February		3,000			4,000
March		3,600			6,000
April		4,500			7,900
May		3,200			5,000
June		5,000			8,000

which graph below shows the behaviour of maintenance costs above

A)

B)

C)

D)