Which of the following is considered verbal behavior?

Verbal behavior encompasses any form of communication that utilizes symbols to convey meaning and is intended for expressing thoughts or conveying information. Sign language is a clear example of verbal behavior as it employs a structured system of hand shapes, movements, and facial expressions to communicate ideas effectively. Similarly, Picture Exchange Communication System (PECS) involves the use of pictures to convey messages, representing a system where symbols (pictures) are exchanged to communicate wants and needs.

In contrast, nonverbal gestures may convey information but do not follow a structured symbolic system in the same way that sign language does. Visual arts communication conveys messages through artistic expression but does not utilize structured language. Physical activity involves engaging in physical tasks or movements and does not involve symbolic or communicative intent related to language, making it distinct from verbal behavior. Thus, option A accurately represents forms of communication that are rooted in structured, symbolic language.