How could the progressive era be seen as a turning point?

The progressive era brought significant reforms to American industrial capitalism and to the American political system, through participation and activism by ordinary Americans. The progressives had organized to improve the working and living conditions for poor people, only really to address the glaring social and environmental problems, as well as expand opportunies for democratic involvement in the political system.

The correct answer for the question is option  > > > d< < <   worked together to keep control of the us in the hands of the wealthy.i hope this answer you guy