TOEFL Listening: ETS-TOEFL听力机经 - 5_5WF4GD5I_38SR2P$

According to the woman, what error did she make in writing her original paper? A. She did not follow the advice of the professor's graduate assistant. B. She forgot to include information about the ancient Romans and Egyptians in the paper. C. She began writing the paper before completing all the necessary research. D. She did not provide citations for all the sources she used to write the paper.