Which definition best fts the term muckraker?

One who inquires into and publishes scandal and allegations of corruption among political and business leaders," popularized 1906 in speech by President Theodore Roosevelt, in reference to "man ... with a Muckrake in his hand" in Bunyan's "Pilgrim's Progress" (1684) who seeks worldly gain by raking filth.

Around 1900, the term for a journalist who exposed corruption in American society