Which of the following refers to the use of facial expressions and body postures in communication?

Nonverbal communication encompasses a wide range of behaviors including facial expressions, body language, gestures, posture, and even the physical distance between individuals during interaction. This form of communication is critical as it often conveys more meaning than verbal communication alone. For instance, a smile can express warmth and friendliness, while crossed arms may suggest defensiveness or resistance.

In the context of interpersonal communication, nonverbal cues can enhance or contradict what is being said verbally. Understanding nonverbal communication is fundamental for effective interaction, as it helps individuals interpret others' feelings, attitudes, and intentions beyond spoken words. Therefore, recognizing the significance of nonverbal cues allows for a deeper understanding of messages and fosters clearer communication.

The other options relate to different aspects of communication or psychological concepts. Feedback refers to the responses or reactions to a message, empathy involves the ability to understand and share the feelings of another, and assertiveness is about expressing one's thoughts and needs directly and respectfully. While these concepts play important roles in communication, they do not encompass the broader range of nonverbal cues that body language and facial expressions do.