Question

What was the name given to the idea that if Vietnam fell to communism, the rest of Southeast Asia would become communist?

A. The roll back theory
  B. The steamroller theory
  C. The communist theory
  D. The domino theory

Answer 1

if your doing connexus the answer is domino theory

Step-by-step explanation:

Answer 2

if you have thought that its A, the guess what its A, i took the test yesterday, "The roll back Theory" is the answer.