Truman's Assumption That the United States Would Maintain Its Containment

Truman's assumption that the United States would maintain its containment policy through a monopoly on nuclear weapons was undercut by __________.

A) the Soviets matching each U.S. atomic and hydrogen bomb development
B) the unsustainable cost of nuclear weapons
C) technical problems that made mass production of nuclear weapons impossible
D) European NATO allies refusing to allow nuclear weapons on their territory