The correct answer is A) Standard Oil received rebates from the railroad companies.
Tarbell and Rockefeller agree on "Standard Oil received rebates from railroad companies.
John Rockefeller was the owner of the Standard Oil Company, a monopoly that controlled the oil industry in the United States. He was growing and growing, buying other companies until he became the absolute owner of the oil business in America. The Oil Standard Company was a key player during the Gilded Age with other monopolistic companies such as the Steel Company owned by Andrew Carnegie.