Who Were the "Muckrakers

Who were the "muckrakers"?

A) A group of journalists in the 1900s who constantly attacked and harassed the government, causing unnecessary distrust among the citizens
B) Corporate newspaper editors of the early 1900s who accepted bribes for favorable reporting
C) Corporate executives during the years prior to the Great Depression who received prison sentences for their roles in corrupt corporate practices
D) A group of journalists in the late 1800s who investigated and exposed corporate and political corruption in American life
E) Journalists who reported on the questionable underworld environment