Which of the following best describes a situation where an oligopoly exists?
O A. A small number of producers command nearly the entire market
for a certain good or service.
B. A single producer is the only one selling a good or service with no
close substitutes.
C. Many producers are selling slightly differentiated products that
are close substitutes of each other.
D. A large number of businesses are selling identical products to a
well-informed customer base.
