The answer is option A (help you be an effective listener).
Explanation:
Non-verbal communication is the message transmitted by facial expressions, body language, eye contact, and smiling among others. Non-verbal communication plays a key role in the transmission of messages, even more than verbal communication.
For example, if we say something we do not believe in, our face will express something different. The interlocutor will perceive that something is going wrong.
Hence, paying attention to non-verbal communication help us be effective listeners.
