Respuesta :
He colluded with railroad companies and established pricing models that
froze out any competition. This essentially meant that Rockefeller had a
monopoly over oil, which meant no other company or business could
compete with him. Although this might seem questionable, it's also
important to remember that Rockefeller did give away most of his wealth
to charity.
The correct answer is:
C. In all his businesses, Rockefeller made a profit and used it to expand or buy other businesses.
This is the business practice Rockefeller repeatedly used that helped him succeed in building his oil monopoly.
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