TOEFL Listening: ETS-TOEFL听力机经 - M7GPH181V2PWE134P$

Why was the experience of visiting anechoic chamber significant for Cage? A. He realized that he could still hear sounds inside the chamber. B. He realized that echoes could be eliminated from a musical piece. C. lie learned the possibility of recording his body's natural sound. D. He discovered that music did not need to he composed in silence.