How/why is the standard oil trust important?

Standard Oil (in full, Standard Oil Company and Trust) was an American company and corporate trust that from 1870 to 1911 was the industrial empire of John D. Rockefeller and associates, controlling almost all oil production, processing, marketing, and transportation in the United States.

Explanation:

Standard Oil gained a monopoly in the oil industry by buying rival refineries and developing companies for distributing and marketing its products around the globe. In 1882, these various companies were combined into the Standard Oil Trust, which would control some 90 percent of the nation's refineries and pipelines

cause we need oil for tons of things

Explanation:

your answer would be (a)