Highlight the phrase that best shows the meaning of murmuring.

As we watched the dance performance, we could hear murmuring among the audience members. The dancers' moves and acrobatics were so unbelievable that people had to talk about what they were watching. I tried to stay silent out of respect. But when the talented performers completed a series of moves in perfect harmony, I couldn't help myself. I quietly spoke with my sister about how lucky we were to see something so special.​