TOEFL Listening: ETS-TOEFL听力机经 - LQ1H6P8T1F3P1P4GP$

What does the professor imply when he suggests the woman should find the original research report? A. He is not familiar with the article the woman used for her paper. B. He wants the woman to compare the original research report with a more recent one. C. The original research report includes additional experiments that the woman should mention. D. The source used by the woman presents information in an unclear manner.