The answer is:
2) Fidel Castro allied himself with communist countries
3) Fidel Castro was responsible for forcing Fulgencio Batista from Cuba
Fulgencio Batista was the elected President of Cuba who had become a US backed dictator. When he was overthrown from power, the United States had lost a close puppet ally.
When Fidel Castro sized power the United States made a weapons Embargo on Cuba. This forced Castro to buy weapons from the Soviet Union, drawing the country closer into communism.
Eventually, this led to a full-blown embargo on Cuba