Juan thinks he has reached the point where he has maximized his profit. However, because this can be tricky to determine, he is not sure. He decides to test it by selling one more unit. If Juan is correct in his assumption, what should happen when he sells this additional unit? A. Profits will be reduced to zero. B. Marginal cost will exceed marginal revenue. C. Profit will increase but at a slower rate. D. Marginal revenue will exceed marginal cost. E. Juan will break even on his sales