The statement that is true is:
Fidel Castro became a communist through the friendship and support offered by the Soviet Union.
Fidel Castro initially had nationalist and anti-imperialist inclinations rather than a defined communist ideology. However, after the Cuban Revolution and the establishment of his government, he increasingly aligned with communist principles, especially due to the support and influence of the Soviet Union during the Cold War. His regime eventually adopted a socialist model, leading to Cuba's close ties with the Soviet Union.