Profit-Maximizing, Monopolistically Competitive Firms

Profit-maximizing, monopolistically competitive firms:

A) consider the actions of their competitors when determining price.
B) do not consider the actions of their competitors when determining price.
C) consider only marginal cost and marginal revenue, which determine the level of output-and the level of output determines price.
D) consider only average total cost and average variable cost, which determine the level of output-and the level of output determines price.
E) take their price from the industry price, as do perfectly competitive firms.