Which statement best describes the united states' cold war policy of containment?

prevent communism from spreading to any additional territories

produce subtle propaganda aimed at communist states

eliminate nations that support communist states

diplomatically isolate nations that maintain friendly relations with communist states

The purpose of the containment policy was to stop the spread ("contain") communism, that is not allow the spread of communism to new countries.

It was not to elimiate communism in countries that already had it: the focus was to "contain" communism: stop the spread, and only this

The correct answer is:
prevent communism from spreading to any additional territories