Which is the BEST example of a cartel currently operating in the world economy?

AThe European Union
BThe World Trade Organization (WTO)
CThe North Atlantic Treaty Organization (NATO)
DThe Organization of Petroleum Exporting Countries (OPEC)

Verified Answer :

D) The Organization of Petroleum Exporting Countries (OPEC)

The Organization of Petroleum Exporting Countries (OPEC) is a cartel made up of countries (and nationalized companies) which cooperate to control the supply (and therefore the prices) of a significant amount of the world's oil.