The Figure Given Below Shows the Aggregate Demand and Supply

Multiple Choice

The figure given below shows the aggregate demand and supply curves of a perfectly competitive market.Figure 10.7

-When long-run average costs are declining for the entire range of demand, the firm is known as a(n) :

A) local monopoly.
B) regulated monopoly.
C) monopolistically competitive firm.
D) natural monopoly.
E) oligopoly.