Gary's Gas and Frank's Fuel Are the Only Two Providers

Gary's Gas and Frank's Fuel are the only two providers of gasoline in their small town.Gary and Frank decide to form a cartel to raise the price of gasoline.The total industry profits are highest when _____ cheat(s) on the agreement,and Gary's profits are highest when _____.

A) neither firm;neither firm cheats on the agreement
B) neither firm;Gary cheats but Frank does not
C) both firms;Gary cheats but Frank does not
D) both Gary and Frank;both Gary and Frank cheat