Progressives worked for new labor laws with the primary purpose to

decrease the quality of working conditions in the US

increase the power and control of factory owners

restrict power of business owners, while increasing rights of workers

maximize profits at all American manufacturing sites

Answer is: restrict power of business owners, while increasing rights of workers.

Progressivism is reform movement that reached its height early in the 20th century. Progressives fight for better wages, better work conditions for workers, thy are agains large corporations and corruption in politics.

C.)

restrict power of business owners, while increasing rights of workers