In October 1962, the U. S. government learned that the Soviet Union was building nuclear-missile bases in Cuba, well within range of the United States. President John F. Kennedy responded by imposing a naval blockade to prevent more missiles from reaching the island nation. For several days, it was not clear how the Soviets would react if U. S. ships tried to stop a Soviet ship at sea. Eventually, the Soviets backed down and agreed to remove the missiles from Cuba.

How did these events bring the world close to nuclear war?

A.
by threatening to dissolve the Warsaw Pact
B.
by creating conflict between the world's two largest economies
C.
by threatening to dissolve the NATO
D.
by creating a confrontation between the world's two superpowers