TOEFL Listening: TPO-TOEFL听力TPO - ISTKF2T7LXO9JMB1R$

What can be inferred about the professor when she says this: A. She is not sure what causes languages to change. B. She does not think that languages change quickly C. She thinks a fad she just mentioned about language might be hard to believe. D. She thinks languages evolved differently in the past than they do now.