A common theme in the discussions of the airline, soft drink, doughnut

A common theme in the discussions of the airline, soft drink, doughnut, and express delivery industries is that oligopolistic firms tend to compete:

A) strictly on the basis of price and nothing else.
B) strictly on the basis of cost minimization.
C) primarily on the basis of product differentiation and price.
D) primarily by erecting barriers into the market.

ANSWER

C