Respuesta :

The Progressives.

Progressivism aimed to improve society by various reforms, and improving dangerous working conditions was a key concern during the Progressive Era (roughly the first two decades of the 20th century).  Progressives used methods like settlement houses to try to provide better social care for poor urban workers.  The labor union movement was also a part of the Progressive agenda.

Answer:  B) Progressives

Explanation: The Progressive Movement was concerned with many things, and improving industrial working conditions was one of them. Politicians from the two major parties were often involved in the movement, which helped create safety standards and laws to end child labor in factories. Also, remember that the Populists were concerned more with agricultural issues and were not as active in the 20th century as they were in the 19th.