Sally doesn't want to be interrupted while she's speaking so she avoids looking at others until she has said all she wants to say. then she looks at the person who wants to respond. sally has used nonverbal behavior to select one: a. establish relational level meanings. b. regulate interaction. c. define her cultural standpoint. d. demonstrate warmth.

Sally has used nonverbal behavior to "regulate interaction".

Nonverbal behavior alludes to correspondence human acts particular from discourse. Since nonverbal behavior incorporates each open human act other than discourse (talked or kept in touch with), it normally covers a wide assortment and scope of wonders.  

In face-to-face interactions, nonverbal behavior imparts a considerable amount about aim. Those practices, for example, outward appearances, the arrangement of head and shoulders, the utilization of hands—can convey data, regulate the interaction, and express emotions and closeness.