Read the following sentences from "The High School Step Team."

As Karla turned away from Jade and walked down the hall towards the math class, she pictured her cousin shrugging her shoulders. "Okay, do whatever you think is best," Jade said. "I'll see you at home."

After reading these sentences, the reader can infer that.
the inswer is
Karla is familiar with Jade's nonverbal reactions.
Why is this answer correct?