What Were Some Ways in Which Reagan's Presidency Was Transformational

What were some ways in which Reagan's presidency was transformational?

A) He decreased the stature of the presidency and placed most responsibility on Congress.
B) He enacted measures that effectively ended deindustrialization.
C) He accelerated the nation's shift toward conservatism and helped diffuse the cold war.
D) He helped increase the longevity of the Soviet Union for many decades to come.
E) He initiated the reputation of the United States as an official nuclear power.