Which statement best explains how the author develops the central idea throughout the passage

well, number 1, the 1920s was not economically prosperous until the start of the lend-lease act, which employed large amounts of people in producing equipment for the allies.

b. world war ii is your answer, because wwi had already ended at 1918, and the cold war was after 1945.

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im pretty sure a would be the answer

i think idk if im right but i think its d

excuse me but there is no picture or question showed in this problem.