If you deleted your first time of you asking it i had said the answer i think is B.
A. The Berlin Airlift
The Soviets couldn't counter it ,so they eventually gave up and reunited Berlin.
On January 20, 1961, the handsome and charismatic John F. Kennedy became president of the United States. His confidence that, as one historian put it, “the government possessed big answers to big problems” seemed to set the tone for the rest of the decade. However, that golden age never materialized. On the contrary, by the end of the 1960s it seemed that the nation was falling apart.
