Applause, laughter, nodding heads, and quizzical looks are examples of which of the following?

Applause, laughter, nodding heads, and quizzical looks are all forms of feedback. Feedback in public speaking refers to the audience's reactions to a speaker's message, which can indicate their level of understanding, appreciation, or confusion. Such responses help the speaker gauge how well their message is being received and can inform any necessary adjustments in delivery or content.

For instance, applause and laughter demonstrate approval and enjoyment, while nodding heads often signify agreement or comprehension. Conversely, quizzical looks might suggest that the audience is confused or requires further clarification. Recognizing and interpreting these signals is crucial for effective communication, as it allows the speaker to respond appropriately to the audience's needs in real time.

The other options relate to different concepts; interference involves distractions that can hinder communication, attending refers to the ability to focus on the speaker and the message, and channels refer to the medium through which the message is conveyed. While all are important in the context of communication, feedback specifically pertains to audience reactions.