16. A perfectly competitive firm has the following cost schedule

Output (units) Marginal Cost

5,000 $4

6,000 $5

7,000 $6

8,000 $7

9,000 $8

If the firm is a profit-maximizing firm and it can sell its output for $7 each, it should produce:

Group of answer choices

a. 5,000 units.

b. 6,000 units.

c. 7,000 units.

d. 8,000 units.

e. 9,000 units.