How Was War Avoided in the Cuban Missile Crisis

How was war avoided in the Cuban missile crisis?

A) the United States agreed to remove its missiles from Europe in exchange for the Soviets' taking their missiles out of Cuba.
B) Kennedy agreed to remove Western troops from East Berlin in exchange for Khrushchev's order to dismantle Soviet missiles in Cuba.
C) the United States agreed to stop its bombing of North Vietnam in exchange for the Soviets' removal of missiles with nuclear warheads from Cuba.
D) Khrushchev agreed to remove Soviet missiles from Cuba in exchange for Kennedy's pledge not to invade that country.
E) Kennedy ended the embargo of Cuba, and Khrushchev transferred its missiles to China.