Final answer:
The described scenario of girls trying on clothes and seeking opinions is most closely related to the situational influence of social surroundings, as they are influenced by each other's presence and views.
Step-by-step explanation:
The situation described with three teenage girls spending an hour trying on outfits and seeking each other's opinions most closely relates to the situational influence of social surroundings. This influence pertains to how the presence, views, and behaviors of other individuals impact a person's behavior. In this case, the girls are influenced by each other's presence and opinions, which is an intrinsic aspect of social surroundings.
When considering the motivation behind teenagers following social norms during clothes shopping, it's typically motivated by a desire to fit in rather than by saving money or following parents' rules. Social influences and the desire to conform to what is perceived as popular or accepted are predominant forces in teenagers' decision-making processes regarding fashion.