Why did the fear of communism spread and intensify in the United States during the 1910s, leading to the Red Scare?

A
The communists who were victorious in the Russian Revolution called for a worldwide communist revolution.

B
The victorious countries in World War I imposed communist reforms on the countries that were defeated.

C
The Communist Party of the United States grew in power and several of its members were elected to Congress.

D
The poor economic conditions caused by the Treaty of Versailles helped communists take power in Germany.