Answer:
D.
Explanation:
The Progressive-era in America was a period of social and political reform across the nation. The aim of the progressive movement was to question the ill-effects brought into the nation with industrialization, urbanization, immigration, and corruption in the government.
After America entered into World War I, it helped in the development of progressivism at home. America's entry into World War I as a moral and democratic venture furthered the cause of the progressive movement.
Therefore, option D is correct.
