According to the encyclopedia, "Progressivism in the United States is a broadly based reform movement that reached its height early in the 20th century. It was middle class and reformist in nature. It arose as a response to the vast changes brought by modernization, such as the growth of large corporations, pollution and fears of corruption in American politics. In the 21st century, progressives continue to embrace concepts such as environmentalism and social justice. Much of the movement has been rooted in and energized by religion."
Thus, the correct answer is:
- A. Progressivism was a movement throughout the United States involving all political parties.
