Which of the following is an example of nonverbal communication?

Nonverbal communication encompasses all forms of communication that do not involve words, including gestures, facial expressions, body language, and other physical cues. Pointing to a glass of water is a clear example of nonverbal communication because it uses a physical gesture to convey a message without relying on spoken or written words. This action can indicate a request, suggestion, or need without the need for verbal explanation.

In contrast, writing a note involves verbal communication, as it is based on written language. Speaking clearly to a client also falls under verbal communication, as it involves the use of spoken words to share information. Reading a client's body language can be considered a part of nonverbal communication, but it focuses on interpreting nonverbal cues rather than providing a direct example of nonverbal communication itself. Thus, pointing to a glass of water represents a direct instance of nonverbal communication effectively.