It would be "d. eight-hour days" that was not a problem faced by workers in nineteenth century mills or mines, since legislation advocating for strict working hours did not come about until the Progressive Era.
Answer: D. Reformation Theory
Explanation:
The Reformation greatly influenced the development of scientific thought. The Reformation as a movement seriously shook the church's authority, which until then had "suffocated" free thought and thus the development of science. After the Reformation period, science flourished as people became freer in their research.
