The USA introduced the 'Policy of containment' to deal with:

Soviet Communism

The correct answer is option (1) - Soviet Communism

1947; American President Harry Truman’s Doctrine about the containment of communism

Out of the choices provided, the Policy of Containment was introduced by the USA to deal with Soviet Communism.

The Cold War, a period of ideological tension between the US and the Soviet Union, was the main reason for the policy. The goal was to prevent the spread of communism throughout the world, not just a specific event like the Berlin Crisis or the Korean War.