TOEFL Reading: ETS-TOEFL阅读机经 - 53GZYG5NI5616575L$

According to paragraph 1, which of the following statements is true of Edison, Carnegie, and Rockefeller? A. They were famous inventors who became rich factory owners. B. They were the first to develop advertising and marketing techniques. C. Their ideas and methods were used to transform United States industry. D. Their companies produced mechanical devices and consumer goods.