Final answer:
The mere-exposure effect explains Mia's perception of Seb's attractiveness because she is more familiar with him due to their frequent interaction, unlike her friends who do not share the same level of exposure. The correct option is c.
Step-by-step explanation:
The differences in perception regarding Seb's attractiveness among Mia and her friends may best be explained by the mere-exposure effect.
This psychological phenomenon suggests that people tend to develop a preference for things merely because they are familiar with them.
Since Mia spends more time with Seb, being classmates, she has likely become more accustomed to, and hence more appreciative of, his appearance and mannerisms.
In contrast, her friends, who do not interact with Seb on a regular basis, haven't had the same level of exposure and therefore do not share Mia's perception.
It's important to note that other factors like the availability heuristic, actor-observer bias, or fundamental attribution error could also influence people's judgments and perceptions, but based on the context provided, the mere-exposure effect seems to be the most fitting explanation. The correct option is c