Answer:
A. The placement of nuclear weapons installations in Cuba.
Step-by-step explanation:
The Brinkmanship policy between the United States and the Soviet Union resulted in the Cold War. The connection between Cuba and Russia began during the Cuban Revolution in 1959 when Fidel Castro managed to defeat Fulgencio Batista. During this period, Cuba received military and financial support from the Soviet Union. The Soviet place nuclear missiles in Cuba in 1962 which threaten the U.S. and other neighboring countries.