The Question of How Much Labor a Firm Will Hire

The question of how much labor a firm will hire comes down to:

A) whether added workers are going to generate more revenue than what it costs to hire them.
B) if the added workers are going to add revenues to the firm.
C) whether the value of the marginal product is greater than, less than, or equal to the average total cost.
D) the healthcare costs they incur by hiring them.