. Which business practice did Rockefeller repeatedly use that helped him succeed in building his oil monopoly?
A.In all his businesses, Rockefeller made a profit and used it to expand or buy other businesses.
B.With every business Rockefeller bought, he would learn about it, sell it at a profit, and buy another business.
C.With every purchase of a refinery, Rockefeller would add new products to his business.
D.In all his businesses, Rockefeller made sure that he controlled all aspects of production.

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Answer:

In all his businesses, Rockefeller made a profit and used it to expand or buy other businesses.

Explanation: just finished the test

The business practice that Rockefeller used that helped him succeed in his oil monopoly was : In all his businesses, Rockefeller made a profit and used it to expand or buy other businesses.

What is monopoly?

This is a term that is used to refer to a single seller or a producer of a commodity that does not have any close substitute.

Rockefeller was known to be an oil giant. A way that he achieved monopoly was by buying the businesses of all of his competitors.

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