Answer:
A) The Soviet Union installed nuclear missiles in Cuba.
Step-by-step explanation:
The Bay of Pigs invasion was the American government's attempt to overthrow the communist leader of Cuba (Fidel Castro). The US trained 1,000 Cuban exiles in militiary tactis and invasion techniques. The government hoped that these 1,000 exiles would help to start a revolution in Cuba to get rid of Castro. Instead, it was a miserable failure for the US as the exiles were easily defeated.
This fear of American invasion caused the Soviet Union (Cuba's ally) to put missiles in their for self defense reasons. This would lead to the Cuban Missile Crisis, the closest the US and Soviet Union ever came to all out nuclear warfare.