How did John D. Rockefeller vertically integrate his monopoly in 1882? O He created a trust that controlled oil wells, refineries, and distribution networks.
O He created a trust that controlled ninety percent of the nation's oil refineries.
He purchased coal plants around the country to add to his business.
He purchased iron mines around the country to add to his business.

He created a trust that controlled oil wells, refineries, and distribution networks.

Explanation:

Vertical integration is the term for the strategy of controlling supply change and distribution. They include the previously existing companies in their chain – ones that operate with production, supply, and distribution.

This strategy was used by John D. Rockefeller in 1882. He created the Standard Oil trust company that included other companies focusing on management, transportation, and distribution of oil and oil wells. It became a very rich business that owned a monopoly over the supply and distribution of the oil, wells, and pipelines.

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explanation:

the president, prime minister, chief justice, speakers and ministers take their oath of office. the oath is taken in bengali