The correct answer is: a) Communism Explanation: The fall of the Berlin Wall in 1989 was a pivotal event that symbolized the collapse of communism in Eastern Europe and the end of the Cold War. The Berlin Wall had been erected in 1961 by the communist East German government to prevent its citizens from fleeing to the capitalist West. Its fall represented the crumbling of the Soviet-led communist bloc and the triumph of democracy and free-market capitalism over the communist system.
