Answer:
d. facial expression.
Explanation:
Non verbal communication may be defined as the non linguistic way of transmitting information in the form of symbols, behaviors, objects or attributes which are intended to communicate information or messages with a social meaning.
Some forms of nonverbal communication are gesture, posture, facial expression, tone of voice, appearance, etc.
Studies have found that facial expression is a form of nonverbal communication which have universal meaning across the world. For example certain expression of fear, sadness, happiness can be easily understood across the globe by the facial expression.
