Identify the function of nonverbal communication in action below.

despite insisting that his story was true, the witness shifted uneasily in his chair and avoided eye contact with the prosecuting attorney.
clarify the relationship
regulate the interaction
increase persuasive power
reveal discrepancies
manage impressions

reveal discrepancies

Explanation:

The non verbal communication implies that the witness behavior shows a sensation of tension and anxiety.

The nonverbal communication in the given statement reveals discrepancies.

Explanation:

Given that even though the story of the witness was true he shifted uncomfortably in his chair and avoided facing the prosecutor. It is clear that the given statement reveals the sensation of tension and anxiety of the witness.  

The term discrepancy means incompatibility. Here, the witness shows off the lack of compatibility thereby avoiding the eye contact with the attorney.

A non-verbal communication or a manual language is the communication between two or more persons using symbols, signs or gestures.