The correct answers are C) advances in technology and E) industrial revolution.
From about 1860-1895, the United States experienced the following broad changes: advances in technology and industrial revolution.
Those years represented a period of significant changes for the United States economy due to the industrial revolution and the advances in technology that came with it. New factories included new machines to manufacture goods. These factories needed workers to operate the machines. That is why many people that lived in the rural areas of the US decided to move to the larger cities where these factories were located in order to look for better opportunities for them and their families. Although the working conditions in the fabrics were poor, it represented a chance to get a job.
