What limits did the U. S. , U. S.S. R., and Great Britain agree to regarding nuclear weapons testing in 1963?

A- each nation was permitted a limited number of tests per year
B- testing could only occur underground
C- testing plans had to be submitted to the other countries for approval
D- all testing had to take place on uninhabited islands

B- testing could only occur underground

Explanation:

During the Cold War and especially after the Soviet Union created an atomic bomb the possibility of a nuclear war was approaching faster than ever. After the Cuban missile crisis it was necessary to create an agreement regarding nuclear testing. That is why in 1963 it was agreed that testing could only occur underground .

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