Which business practice did rockefeller repeatedly use that him succeed in building his oil monopoly? a)in all his businesses, rockefeller made sure that he controlled all aspects of production. b)with every purchase of a refinery, rockefeller would add new products to his business. c)in all his businesses, rockefeller made a profit and used it to expand or buy other businesses. d)with every business rockefeller bought, he would learn about it, sell it at a profit, and buy another business

Rockfeller used the buy and sell method. He would purchase other products to his business and then used it to expand or buy other companies, where he created a monopoly. He wanted to have ownership in different companies and also use his knowledge to learn about new and innovative products. Each product learned was wisdom gained for him. He knew how to manipulate the businesses so each person would want to buy his name. Eventually he became know as one of the richest men in america, all because he was a smart business man with a great attitude.

It's c i just did the test