Which of the following correctly identifies the main cause for Progressivism?
A. a vision that state lawmakers and the federal government were working for the good of society and its people
B. a belief that nothing could stop urbanization and industrialization from creating social and political problems
C. a country with a shrinking middle class, satisfied factory workers, and a few poor Americans doing charitable work
D. a society with corrupt government and big business, harsh labor conditions, and inadequate social welfare laws