How did john d. rockefeller gain control of the oil industry

by the early 1880s controlled some 90 percent of U.S. refineries and pipelines. Critics accused Rockefeller of engaging in unethical practices, such as predatory pricing and colluding with railroads to eliminate his competitors, in order to gain a monopoly in the industry

Explanation:

its perfect how it was

c. women being denied the type of education men received