The correct option is B. M. Tarbell's investigations reveal John D. Rockefeller's corrupt practices at Standard Oil.
What was Ida Tarbell's main focus?
Tarbell thought it was possible to learn "the Truth and motives of strong people." She started to believe that this Truth could be expressed in a way that would "prompt significant social transformation.
After the publication of her 19-part exposé of the business practices of John D. Rockefeller's Standard Oil Company, which had destroyed her father's oil business in the 1870s as well as numerous other small oil-related businesses in Pennsylvania, Ida M. Tarbell's name would come to be associated with the term "muckraker," earning her the nickname.
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