Which event did not occur during the cold war period?

the arrest of millions of people who opposed the communist government

armed conflict between the united states and the soviet union that led to the breakup of the soviet union

soviet control of communist governments in eastern europe

a huge buildup of military weapons by both the united states and the soviet union

A.

Explanation:

In the U.S, we had the "Red Scare" incident. Which anyone accused had to testify to the House of Un-American Activities. Thousands were arrested but not millions. But if you were accused of communism you had to testify and point a finger to someone else to be found innocent. But when you are accused you were blacklisted which made it harder to find jobs;

you go to appeals court like section e