Question

Which of the following are examples of America's policy of containment?

I. Iron Curtain
II. Truman Doctrine
III. North Atlantic Treaty Organization (NATO)
A. I B. I and II C. II and III D. I, II, and III

Answer 1

the term I. Iron Curtain was used for Russia controlled Europe so that's wrong

III. North Atlantic Treaty Organization (NATO) was The North Atlantic Treaty Organization or NATO , also called the (North) Atlantic Alliance, is an intergovernmental military alliance based on the North Atlantic Treaty which was signed on 4 April 1949. The organization constitutes a system of collective defence whereby its member states agree to mutual defense in response to an attack by any external party. NATO's headquarters are in Brussels, Belgium, one of the 28 member states across North America and Europe, the newest of which, Albania and Croatia, joined in April 2009. An additional 22 countries participate in NATO's Partnership for Peace, with 15 other countries involved in institutionalized dialogue programs. The combined military spending of all NATO members constitutes over 70% of the world's defence spending.

so the only example of America's policy of containment.
The Truman Doctrine was the American policy in 1947 of providing economic and military aid to Greece and Turkey because they were threatened by communism. It was the start of the containment policy to stop Soviet expansion; it was a major step in beginning the Cold War.