I think your answer is B, in the 1920s the American economy began to contract and the depression lasted about a year
The Truman Doctrine was an American foreign policy created to counter Soviet geopolitical expansion during the Cold War. It was first announced to Congress by President Harry S. Truman on March 12, 1947. More generally, the Truman Doctrine implied American support for other
nations threatened by Soviet communism. The Truman Doctrine became the
foundation of American foreign policy, and led, in 1949, to the
formation of NATO, a military alliance that is still in effect.
I think it’s C? Yea I think so