which of these best describes the business practices of john d. rockefeller? a he took over competing…

which of these best describes the business practices of john d. rockefeller? a he took over competing companies to create a monopoly in the oil industry. b he joined railroads to build a more efficient railroad system. c he gave loans to other companies so they could expand their operations. d he gradually bought steelworks to create a giant steel - making company.
Answer
Brief Explanations:
John D. Rockefeller was a prominent figure in the oil - industry. He used horizontal integration by taking over competing companies to create a monopoly in the oil industry. This was a key business practice of his to gain significant market control.
Answer:
A. He took over competing companies to create a monopoly in the oil industry.