Answer:
b. a major role for genetics as well as environment in the control of facial expressions
Step-by-step explanation:
Facial expression: The term facial expression is described as one or more than one positions or motions of the different muscles that are being present beneath an individual's facial skin. The movement of face muscles displays the emotional state of a person to observe and s often considered as a type of "nonverbal communication".
However, as nature and nurture studies have shown that genetics and environment both play a crucial and important role in an individual's development including facial expressions.