Answer:
Gestures and posture
Explanation:
There are two forms of communication, verbal and nonverbal communication. In nonverbal communication, words and sentences are not used to transfer the information. The use of oral and written words do not exist. Instead, the body language, postures, gestures, and facial expressions are taken into consideration. In the given situation, John gives certain advice to Erika which would help her in judging the interest of the client. He asks her to pay attention to her gestures and postures to conclude.