Answered

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How did John D. Rockefeller's purchase of a barrel-making factory contribute to the expansion of his petroleum business?
А
It allowed him to reduce his cost of production
B
It allowed him to guarantee he had the best barrels.
С
It allowed him to diversify his investments and make more money.
D
It allowed him to make enough money building barrels to buy established petroleum companies.

Sagot :

Answer:  B

Explanation:

It allowed him to reduce his cost of production

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