Which of the following was one reason that World War II alliances broke down following the end of the conflict?

Britain refused to impose reparations on Germany and other aggressor nations.
France refused to permit socialist parties to participate in government.
Roosevelt insisted on maintaining an American occupation zone in Germany.
Stalin broke promises to allow free elections in Eastern Europe.

Stalin broke promises to allow free elections in Eastern Europe.

The reason that World War II alliances broke down following the end of the conflict was that Stalin broke promises to allow free elections in Eastern Europe.