I think the answer is C but i could be wrong
Answer:
The Bay of Pigs invasion failed which caused distrust and increased tensions between the US and Cuba. It brought the Soviets and Cuba closer together because Khrushchev saw what the US tried to do and he asked Castro to be allies. Castro accepted because he needed a strong ally. Khrushchev and Castro start to build missile launchers in Cuba. Thus starting the Cuban Misslle Crisis.