Final answer:
External social cues are the influences on a customer's behavior that stem from family and friends, affecting their decision-making in areas like purchases.
Step-by-step explanation:
The term for behavior influences that come from a customer's family and friends is B. External social cues. These are the social signals and pressures that influence a person's decision-making process, particularly in contexts such as purchasing decisions where the preferences and opinions of family and friends can have a significant impact.
Unlike internal physical cues that relate to an individual's innate desires and needs, or external commercial and retailer cues that come from marketing and store attributes, external social cues derive from the social environment surrounding the individual.