The correct option is D To defuse this issue, the USA had agreed to never attack on Cuba.
The Cuban Missile Crisis occurred in 1961. The USA was planning to overthrow the Castro's regime of Cuba. Prime reason for the crisis was installation of nuclear missiles in Cuba by USSR. The USA and USSR was the responsible for this crisis. To defuse this crisis, both countries reached an agreement. Under this, the USSR agreed to withdraw the missiles and the USA would never attack on Cuba again.