Answer:
The Domino Theory was based on the idea that communism was a contagious force that spread from country to country. It was first advanced during Harry S. Truman's presidency, when WW2 ended, as the United States adopted the policy of Containment to restrict communist expansion and the sphere of influence held by the USSR.
Answer:
that people in front of them die and then econmony went down
Explanation:
I believe it is B, but I know for sure it is not A, I can try and leave some links for you to get more info on it