Progressive journalists who reported on society's problems were called: O A. Coalsifters.
O B. Yellow journalists.
O C. Muckrakers.
O D. Paparazzi.

C... Muckrakers

Explanation:

Muckrakers were investigative reporters and writers during the Progressive Era (1890–1920) who wrote about corruption and injustices in order to bring about changes in society. Hope this helps ! ;)

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