A monopolistically competitive firm is producing at a short-run output level where average total cost is $10.00, marginal cost is $5.00, marginal revenue is $6.00, and price is $12.00. In the short run, the firm should:
A. Decrease the level of output.
B. Increase the level of output.
C. Make no change in the level of output.
D. Increase product price.