TOEFL Listening: TPO-TOEFL听力TPO - 19WN29F98B88131BR$

What does the professor imply when she says this: A. She is confident that no more examples should be necessary. B. She is eager to find out whether the students can provide other examples. C. She wonders whether her explanation may be too difficult to understand. D. She is surprised that her students have understood her point so quickly.