Under Conditions of Oligopoly,economies of Large-Scale Production Mean That

Under conditions of oligopoly,economies of large-scale production mean that:

A) firms are able to sell all of the output they desire.
B) it is difficult for a firm to determine its profit-maximizing price and output.
C) large firms would find it more profitable to break up into smaller production units.
D) small firms are at a disadvantage in competing with relatively large firms.