what was the core business that made standard oil a horizontally integrated monopoly?\nrefining…

what was the core business that made standard oil a horizontally integrated monopoly?\nrefining oil\ntransporting oil to customers\nbuilding oil pipelines\nfinding new uses for oil
Answer
Answer:
refining oil
Brief Explanations:
Standard Oil became a horizontal - integrated monopoly mainly through oil - refining. It bought out many competing oil - refining companies to control the refining process and dominate the market.