Which One of the Following Characteristics Applies to Oligopolistic Markets

Multiple Choice

Which one of the following characteristics applies to oligopolistic markets?

A) There is free entry of rival firms.
B) Firms are so large relative to the market that they do not have to consider the behaviour of rival firms.
C) Firms are mutually independent because there are many firms in the industry.
D) Firms have to consider the behaviour of their rivals since their rivals are also large relative to the size of the market as a whole.
E) Economic profit of each firm equals zero.