The option that best explains why Cuba became a communist government after 1945 is:
due to a lack of economic development and the brutal dictatorship of Fulgencio Batista.
This statement addresses the socio-political context in Cuba leading up to the revolution that led to the emergence of a communist government. The repressive regime of Batista contributed to widespread dissatisfaction among the populace, creating fertile ground for revolutionary movements, including those led by Fidel Castro and his allies, who ultimately established a communist government in Cuba.