Complete the sentence. After WWI, the first Red Scare continued until...
a) An Italian anarchist blew himself up in front of AG's house.
b) Policemen put down a violent revolution of communists that erupted in NYC on May Day in 1920.
c) There were no communists left anywhere in the United States.
d) Americans demonstrated they were weary of the government violating their civil liberties. (They consequently voted for a "return to normalcy.")