Which of the following is NOT a form of verbal behavior?

The correct choice identifies non-verbal cues as not being a form of verbal behavior. Verbal behavior, as described in the context of behavior analysis, specifically pertains to communication that involves language, whether spoken, written, or signed.

Gestures, sign language, and written communication all fall within the spectrum of verbal behavior because they represent forms of communication that convey meaning using symbolic language.

Non-verbal cues, on the other hand, do not involve language in a symbolic form. They can include body language, facial expressions, and other forms of communication that do not use words or symbols. Thus, these cues do not meet the criteria for verbal behavior and are considered separate forms of human communication. Understanding this distinction is crucial in analyzing how language and communication functions in educational contexts and behavior analysis.