Answer:
Social Referencing.
Step-by-step explanation:
Social Referencing is a process in which an infant learns to take cues from the behaviors, emotions, and actions of the adults around them, especially parents or caretakers. In this process, they take cues by looking at the facial expressions of parents or caretakers to know how to respond in a certain situation.
In the given case, Regina's looking at her mother when an unfamiliar man approached her exemplifies social referencing. She was referring to the facial expressions of her mother on how to react at this approach of a strange person.
Thus the correct answer is social referencing.