Which of the Following,if True,will Be the Best Example of an Oligopoly

Multiple Choice

Which of the following,if true,will be the best example of an oligopoly market?

A) The cigarette industry where a similar product is produced by a small number of sellers
B) Dine-in pizza outlets where a differentiated product is produced by a large number of sellers
C) The milk industry where a homogeneous product is provided by a large number of sellers
D) The market for electricity where a single firm can produce electricity at the lowest possible cost