What was the name of the theory that said that if one country in a region fell to communism, others would surely follow?

a. domino theory
b. arms race
c. brinkmanship
d. containment theory

The answer is: A. domino theory

This theory was popularized by president Eisenhower. according to him, communists countries impose a strong military dictatorships in their territories. This mean that if these communists countries were left unintervined , they would gradually conquered other countries like dominos as they gained more influence.

answer; i believe that the correct answer is ; the eastern and western churches spoke different languages;

i would say b. research typically uses a variety of sources