Which term best describes journalists who worked to expose abuses of corporate power, thereby gathering public support for regulation and reform, during the progressive era?

The correct term in A. Mucrakers. The term muckraker was used in the Progressive Era to characterize reform-minded American journalists who wrote largely for all popular magazines. The modern term is investigative journalism, and investigative journalists today are often informally called "muckrakers." Hope this helps and, if you get more than one answer and see it fit to do so, please mark me Brainlest Answer! Thanks!

3. i would say one, but one is not prime nor composite.

Ithink or blue