Beginning in 1947, the united states' policy of "containment" was
a. the basis for its foreign policy for more than forty years.
b. first applied in poland.
c. an extension of the atlantic charter.
d. both the basis for its foreign policy for more than forty years, and an extension of the atlantic charter.
e. none of these answers is correct.

a  hope this helps

Explanation:

Containment was a United States policy using numerous strategies to prevent the spread of communism abroad. A component of the Cold War, this policy was a response to a series of moves by the Soviet Union to enlarge its communist sphere of influence in Eastern Europe, China, Korea, and Vietnam.

3.a

4.d

5.b

6.b

7.c

8.a

9.d

10.a