Answer: (B) Non verbal communication
Step-by-step explanation:
The non-verbal communication is the type of communication which uses the body languages such as facial expression, posture, physical movement and various types of gesture for the communication. The non-verbal communication is one of the type of transmission of message or information in non-linguistic manner.
According to the question, the Samuel is the manager and he always observe the facial expression, gesture and this is the example of non-verbal communication.
Therefore, Option (B) is correct.