Concept:An agreement among independent businesses to divide a market by assigned quotas is a cartel.Explanation:Independent firms sometimes cooperate to reduce competition and control prices.Sharing the market on a quota basis means each firm gets a fixed share or output limit.This kind of formal arrangement is called a cartel.It is different from a trust, integration, or syndicate because cartels specifically involve market-sharing and quota agreements between otherwise independent firms.Answer:D. cartel.