Answer: B. Regulate the interaction
Explanation: Jerry's behavior or actions while his friend was speaking depicts a combination of non-verbal communication methods or behavior which can be used to regulate an interaction. Actions such as leg crossing, slouching - which involves sitting in a lazy or uninterested or weary manner and yawning which depicts tiredness or sign of sleepy feeling are ways of informing the speaker to round up or shows signs of being uninterested or tired of the conversation.
You would say it like this 欢迎回家 or like <span>Huānyíng huí jiā.</span>
It could cause drowsiness or impair your reaction time
