Answer:
A. Upton Sinclair and Lincoln Steffens
Explanation:
In the start of the 20th century when investigative journalism started, Ida Tarbell revealed the expanding tentacles of Standard Oil, while Upton Sinclair portrayed the unpretentious reality of high meat packing and the clothes of political fraud by Lincoln Steffens. Theodore Roosevelt called these authors 'muckrakers', as many of them felt that they were in integrity and only raked muck, dirt, misdeed and scandal. His negative term remained unchanged, even as science.
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