Respuesta :

Answer:

a. He formed a trust.

Explanation:

According to my research on the different Business ventures of John D. Rockefeller, I can say that in order to gain control of the oil industry John D. Rockefeller formed a trust. This allowed him to get around state laws in order to gain control. Once he had control he developed a business method for maintaining control of this and different industries called Horizontal Consolidation.

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