The Warsaw Pact was created in response to the formation of NATO (North Atlantic Treaty Organization). It was established by the Soviet Union and its Eastern European allies in 1955 as a collective defense treaty. The Warsaw Pact served as a counterbalance to NATO's military presence in Western Europe and was primarily a response to perceived threats from the West during the Cold War. Its member countries included the Soviet Union, East Germany, Poland, Czechoslovakia, Hungary, Romania, Bulgaria, and Albania. Answer: A