Mike Wants to Set Up a Factory to Manufacture Roller

Mike wants to set up a factory to manufacture roller skates.He plans to employ a hundred people in his office.Mike's other expenses include rent, utilities, insurance, administrative salaries (for executives and higher-level managers) , and depreciation of the physical plant and equipment.The raw material and labour to make the skates constitute the:

A) break-even point.
B) variable costs.
C) contribution per unit.
D) demand curve.
E) fixed costs.