A client's voice lowers to a whisper when he talks about being physically assaulted by a co-worker. This change in vocalization would be categorized as:

A) kinesics.
B) proxemics.
C) paralinguistics.
D) microverbalization.

Vocalization

The act of producing sounds or words with the voice, which can be a component of communication, expression, or therapy.

Physically Assaulted

Being attacked or harmed in a physical way by someone.

Paralinguistics

The aspect of communication that involves the non-verbal features that accompany speech, such as tone, loudness, pitch, and rate of speaking.