TOEFL Reading: ETS-TOEFL阅读机经 - DG6985DHL53GXK0RL$

According to paragraph 3, which of the following was true of John D. Rockefeller? A. He acquired most of the oil refineries in Cleveland, Ohio. B. He bought some companies solely because they made supplies for competing oil refineries. C. He limited sales of Standard Oil petroleum to companies associated with competing refineries. D. He built many more new oil refineries than he bought.