Which of the following is the best definition of the term mutually assured destruction? a policy of limiting nuclear testing to underground areas an idea that the threat of war was enough to prevent an attack a fear of producing powerful, destructive weapons a belief that a nuclear war would completely destroy both sides

A belief that a nuclear war would completely destroy both sides

Explanation:

Mutually Assured Destruction is a doctrine and a military strategy that holds that when two or more opposite sides or nations have a similar amount of nuclear weapons, neither side would dare to strike first, as a guaranteed second strike from the opponent, and the strikes that would follow, would destroy all sides involved in the war and even all civilization as we know it. This way, this military strategy has also become a form of national security for some countries (like the U.S. and the USSR during the Cold War) as the sole potential of using nuclear weapons is a deterrent against nuclear war itself.