Final answer:
The concept of social perception, which falls under social psychology and involves understanding how an individual's behavior and self-image can be influenced by perceived societal norms, best describes the situation where a person feels self-conscious about their appearance.
Step-by-step explanation:
The concept that best describes the situation where a person becomes self-conscious about their appearance due to someone else's actions, such as glancing at their hair, is known as social perception. It is the study of how we form impressions and make inferences about other people's thoughts and intentions, and it often affects our own behavior and self-image in social interactions. In this scenario, the student's concern over their hair is a direct response to their interpretation of their classmate's looks, and thus affects their behavior to smooth their hair out.
This concept of social perception ties into the broader themes of social psychology and self-awareness within the realm of Social Studies, as it involves understanding oneself in the context of social interactions and the impacts of perceived societal norms and behaviors.