United States History Question of the Day

Offensive Soviet missiles in Cuba were just one of the causes
of Cold War tensions between the U.S. and Soviet Union in the 1960s.
Here Ambassador Adlai Stevenson displays photos of Soviet missiles to
the United Nations.
(Source:Wikimedia
Commons--public
domain)
Question 01003:
What 1960 Cold War incident proved embarrassing for the U.S. and led to
the release of a Soviet spy?
(A) building of the Berlin Wall
(B) launching of Sputnik
(C) a Richard Nixon-Nikita Khrushchev
"kitchen" argument in Moscow
(D) the shooting down of a U.S. U-2 spy plane
captained by Francis Gary Powers
(E) the Bay of Pigs invasion