In an oligopoly such as the U.S. domestic airline industry, a firm such as United Airlines would

a. carefully anticipate Delta, JetBlue, and Southwest’s likely responses before it raised or lowered fares.

b. pretty much disregard Delta, JetBlue, and Southwest’s likely responses when raising or lowering fares.

c. charge the lowest fare possible to maximize market share.

d. schedule as many flights to as many cities as possible without regard to what competitors do.