Graph of Nuclear Weapons Stockpiles, 1945 to 2015. The data in the chart best supports which of the following claims?a The Soviet Union was primarily responsible for the escalation of the arms race in the 1950s and the 1960s.b The Soviet Union and the United States usually had about the same number of nuclear weapons.c The Soviet Union was behind in stockpiling weapons until about 1980, when it overtook the United States in the number of weapons.d The Soviet Union conceded defeat in the arms race when the United States had a large enough lead in the number of weapons.

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