When Steve spoke with his professor about the group$$s deadline, he began by saying, $$Dr$.$ Cross, I have a question to ask you.$$

The professor smiled and said, $$Don$$t be so formal! We know each other by now. You can call me Carly. What can I do for you?$$

Steve began to explain his concerns to the professor but was very uncomfortable asking for a later deadline. He spoke very softly, bounced his legs up and down in jittery movements, and frequently looked around the room with a worried expression on his face.

Finally, Dr$.$ Cross said, $$You want me to change the deadline back, don$$t you?$$

Relieved, Steve said, $$How did you know?$$

$$When a student has a worried look, can't stop jittering, and calls me $$Dr$.$ Cross,$$ I know they$$re going to ask for some kind of favor. People assume that because I$$m the professor, I$$m all$-$powerful and unbending. Let$$s talk about the situation.$$

After a short discussion, Dr$.$ Cross agreed to move the deadline a little further back to give all the groups more time to complete their projects. Steve thanked her and texted his groupmates, who were all very pleased by the news.

Before he left the office, Steve turned to Dr$.$ Cross and said, "Carly, I have to also thank you for introducing me to Liu, Donald, and Shen. I've learned a lot in this class, but I've also gained some wonderful new friends."

Dr$.$ Cross realized that Steve wanted to ask for a favor because of how he was communicating, not what he was saying. Steve's worried facial expression is an example of $\_\_\_\_\_\_\_\_\_\_.$

vocalics

physiognomics

kinesics

haptics