The bay of pigs invasion was an attempt to overthrow whom? a. the batista regime b. fidel castro c. the kennedy administration d. nikita khrushchev

B. Fidel Castro. The Bay of Pigs invasion was led by the Cuban Democratic Revolutionary Front, which was a group of mostly Cuban exiles that was sponsored and trained by the United States Central Intelligence Agency. They attempted to overthrow the communist regime of Fidel Castro, who allied Cuba with the Soviet Union.

Correct  

B. Fidel Castro

Details:

Cuban exiles were trained by the USA's Central Intelligence Agency, with the intent of overthrowing Fidel Castro's communist government in Cuba.  Within just three days in April, 1961, the force of exiles invading at the Bay of Pigs was soundly defeated by the Cuban Revolutionary Armed Forces, commanded by Castro.  In the aftermath of the Bay of Pigs affair, Cuba requested that the USSR (its communist sponsor) should place missiles in Cuba to deter further US-sponsored action against the Castro regime.  That request, coupled with the fact of American missiles that were located in Europe, within striking distance of the USSR, prompted Nikita Khrushchev of the USSR to send the missiles to Cuba.  And that became the "Cuban Missile Crisis" of 1962.