The United States Believed That the Key to Containing Communism

The United States believed that the key to containing communism to the countries Stalin already had was

A) keeping a significant military force in all other European countries.
B) making sure that West Germany was economically successful.
C) gaining control of East Berlin.
D) convincing Europe's neutral countries that joining the fight against communism was necessary.
E) getting rid of Stalin, by assassination if necessary.