A Perfectly Competitive Firm Is Selling 150 Units of Output

A perfectly competitive firm is selling 150 units of output per week at a price of $20. Average total cost is $18, average variable cost is $16, and marginal cost is $15. From this information, it is clear that the firm

A) can increase its profit by producing more output per week.
B) can increase its profit by producing less output per week.
C) can increase its profit by charging a price above $10.
D) None of the above is correct.