An Incumbent Firm Uses Limit Pricing

An incumbent firm uses limit pricing

A) to set price below a potential rival's marginal cost, thus making entry unprofitable.
B) to set one price for a quantity of a good below a certain limit, and a second price for purchases above the limit.
C) when it has no other advantages over a potential rival.
D) if it is limited in the quantity of inputs it can purchase to produce output.