TOEFL Reading: ETS-TOEFL阅读机经 - 6O91_HO41A3YC5P7L$

According to paragraph 6, why did scientists continue to believe that the hereditary material was a protein A. Scientists thought that the research of Avery and his colleagues provided insufficient information about the nature of DNA. B. Scientists believed that only proteins were complex enough to carry genetic information. C. Scientists thought Avery and his colleagues had little understanding of the physical basis of inheritance. D. Scientists ignored important milestones that indicated the chemical complexity of DNA.