Why was the cold war considered an important historical conflict between the united states and the soviet union, even though the two countries never actually fought any battles against each other?

a. the two countries never actually agreed to a peace treaty to legally end world war ii.

b. the two countries were engaged in a tense rivalry that could have produced a nuclear war.

c. the two countries only hired foreign soldiers to launch attacks on each other's home soil.

d. the two countries repeatedly tried to start wars but were stopped by international organizations.