John D. Rockefeller’s business in the 1860s was transporting petroleum products.Why did John D. Rockefeller create a barrel-making factory at the same time? A.He did not want to continue paying another company for barrels. B.He foresaw that oil might not remain a stable investment. C.He realized transporting oil in barrels would be faster than using pipelines. D.He wanted to set the price other oil companies had to pay for barrels.