Answer :B, Standard Oil controls the docks and railroads so independent dealers cannot ship oil.
Explanation:
The unfair practice about Standard oil was the fact that they practiced monopoly.
This was a business that was owned by one of the greatest Industrialists in the USA at the time.
It was a monopoly that was owned by John D Rockefeller and his associates.
The company practiced monopoly by buying the rival businesses and refineries.
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