How did the united states and its western allies finally achieve victory in the cold war?

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The victory in the Cold War did not come directly. There were no clashes between the American allies and the Soviet Union in an obvious way. However, indirect conflicts, such as the war in Korea or Vietnam, led to several deaths. The victory of the capitalist countries took place gradually. The Soviets were isolated from the world, seeing their economy in ruins, losing influence in the nations it dominated. With the fall of the Berlin wall, finally the Soviet Union admitted its bankruptcy, being, in the decade of 90, extinct.
 
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Ibelieve the correct answer would be  a. persians