Suppose a firm is producing a level of output such that marginal revenue is equal to marginal cost. The firm is selling its output at a price of $16 per unit and is incurring average variable costs of $14 per unit and average total costs of $18 per unit. Given this information, it may be concluded that the firm:
A. Continue to produce since she is earning a positive economic profit.
B. Continue to produce since she is covering some of her fixed costs.
C. Decrease production since it will increase her economic profit.
D. Shut down immediately.
E. Increase production since it will increase her economic profit.