The Marginal Approach to Profit

The marginal approach to profit

A) says that a firm should take any action that adds more to cost than it adds to revenue
B) says that a firm should take any action that adds more to revenue than it adds to cost
C) says that a firm should strive to set profit equal to zero.
D) says that a firms profit is maximized when average revenue equals average cost
E) says that profit should be marginalized