Why did Cuba adopt communism in the 1960?

Castro began increasingly to denounce the United States and to seek support from the communist bloc nations. In the face of rising provocations, the Eisenhower administration at first adopted a policy of patient waiting. During the summer of 1960, however, American policy stiffened. The United States placed a temporary embargo on the purchase of Cuban sugar and urged the 21-nation Organization of American States (OAS) to condemn Cuba's actions. The OAS, while it did not directly criticize the Castro regime on this occasion, did condemn communist interference in the Western Hemisphere.

the answer is d. selective incorporation. (apex)