Why will the Cuban Revolution will be important to the Cold War?

pls help me nd write at least 1 to 2 paragrapgh

Fidel Castro, the apostle of revolution who brought the Cold War to the Western Hemisphere in 1959 and then defied the United States for nearly half a century as Cuba’s maximum leader, bedeviling 11 American presidents and briefly pushing the world to the brink of nuclear war, died on Friday.

#2 the answer is d

#3 the answer is a

#4 the answer is b