Who authored "History of Standard Oil," revealing the monopolistic practices of Rockefeller?

The correct answer is Ida Tarbell, who authored "History of Standard Oil." In her work, Tarbell conducted a meticulous investigation into the practices of the Standard Oil Company and its founder, John D. Rockefeller. Her writing exposed the unethical business practices that led to the company's monopolistic control over the oil industry. Tarbell's investigation is recognized as a significant contribution to the Progressive Era's push for reform and regulation of big businesses.

She utilized journalistic techniques to uncover the company's tactics, including predatory pricing and coercive agreements, which allowed Standard Oil to eliminate competition and dominate the market. Tarbell's work not only informed the public of these injustices but also played a role in the eventual breakup of Standard Oil in 1911 under antitrust laws. Her investigative journalism set a precedent for future muckrakers, shaping the field of investigative reporting and contributing to public discourse on corporate regulation and consumer protection.