【单选题】Americans had always been preoccupied with reforming their society, with 'making it over,' and between the 1890s and the end of the First World War, the reform. spirit intensified. More and more peopl...
A.
the reasons for the Progressive Movement
B.
the problems that American society faced between the 1890s and the end of World War I
C.
the causes and contents of the Progressive reform
D.
the belief that Americans possessed in their society