TOEFL Listening: ETS-TOEFL听力机经 - 50R2F4GT3L8PQL7AP$

What does the professor imply about critics who had a negative reaction to Musique concrete? A. They were biased because it could not be performed by live musicians. B. They came to appreciate it more over time. C. Their exposure to it was too limited to offer a fair critique. D. Their definition of music was too narrow.