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In 1960 which of the following contributed most directly to Soviet leader Nikita Khrushchev's cancellation of a scheduled summit meeting with President Dwight D. Eisenhower?:

Athe rise to power of Fidel Castro in Cuba.
Bthe failure, at the Bay of Pigs, of a U. S.-sponsored attempt to oust Fidel Castro.
Cthe downing of an American U-2 spy plane over the Soviet Union.
Dthe sending of U. S. troops to Lebanon.
Ethe success of the Soviet space program in launching the Sputnik satellite.

Verified Answer :

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Answer: C. the downing of an American U-2 spy plane over the Soviet Union.

The downing of the American spy plane in Soviet Union named U-2 contributed mostly to the cancellation of a scheduled summit between the Soviet Union's leader Nikita Khrushchev and that of President Dwight D. Eisenhower.