The journalist that is correctly linked to the proper subject is Upton Sinclair−the handling of food products.
- This is evident in the fact that Upton Sinclair became popular after releasing his popular book titled "The Jungle".
- The book revealed all the terrible and unhealthy situations and practices that are characterized by the meat-packing industry.
- Option A is wrong because Jacob Riis is famous for writing about the living conditions of immigrants.
- Option B is wrong because Ida Tarbell is famous for exposing the dealings of the Standard Oil Company.
- Option D is also wrong because Lincoln Steffens also became popular following the release of his book titled "The Shame of the Cities," which exposed the political corruption in cities.
Hence, in this case, the correct answer is option C. "Upton Sinclair−the handling of food products."
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