TOEFL Listening: ETS-TOEFL听力机经 - PZHO2B1NS4JQ80G1P$

What does the professor imply when he discusses the audience at the first performance of 4'33"? A. He believes that outside noise might have distracted the audience. B. He thinks that music critics appreciated the piece more than the general audience did. C. He thinks that the audience was not mature enough to appreciate the piece. D. He thinks that the audience's response to the piece was understandable.