During the détente era what occurred is described as arms limitation. Thus the correct answer is A.
Between the superpowers, there was a time of diplomacy during which tensions were low and relations were good. Détente was the result of a number of circumstances and reasons, including nuclear concerns, domestic problems, changes in leadership, and policy flexibility.
During the détente era, arms limitations occurred which helps superpowers to spend less on the Cold War They might instead concentrate on issues within their own nations.
Therefore, option A is appropriate.
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