Which of the following is an example of nonverbal communication?

Nonverbal communication is a form of interaction that occurs without the use of spoken or written words. It includes gestures, facial expressions, body language, and other physical cues that convey messages to others. Pointing to a glass of water is an effective demonstration of nonverbal communication because it utilizes a physical gesture to indicate a need or desire without any words being spoken. This action can clearly communicate the request to someone else, making it understandable without needing verbal language.

The other options involve spoken or vocalized elements that do not fit the definition of nonverbal communication. Asking for a glass of water relies on verbal communication, as does screaming for a glass of water—both of these actions use words and vocal tones to convey the message. Similarly, saying "I don't like water" is a direct verbal expression of opinion, which also does not classify as nonverbal communication. Thus, pointing is the only example among the choices that exemplifies nonverbal communication effectively.