john d. rockefeller gained control over much of the oil industry by
a.
managing a trust made up of standard oil and allied companies.
b.
buying large sections of the transcontinental railroad.
c.
going into partnership with andrew carnegie.
d.
charging higher prices than his competitors.
select the best answer from the choices provided
a
b
c
d

ANSWER:

The right answer is option a, managing a trust made up of Standard Oil and allied companies.

EXPLANATION:

John D. Rockefeller had a monopoly in the oil industry. He managed a trust made up of "Standard Oil and allied companies". All the demands of oil were fulfilled by the company of John D. Rockefeller because he used to sell the oil in lesser cost than the production cost in his early stages. Once he had the monopoly in the market then he started earning the immense amount of money.