What factor might be preventing Stefan from fully adjusting to his school in the US, despite his English proficiency?

Stefan's adjustment to a new school environment can be significantly influenced by his sense of belonging and connection to the school community. The correct answer highlights that a lack of identification with the school population can create feelings of isolation and make it challenging for him to engage fully with his peers and the school culture.

In many cases, students who do not see themselves reflected in the school community—whether through cultural, racial, or socio-economic lenses—may struggle to form friendships, engage in classroom discussions, or participate in extracurricular activities. This lack of connection can hinder their overall school experience and emotional well-being, leading to difficulties in adjusting, even if they possess strong language skills.

Other options may suggest potential barriers, such as imaginative distractions or academic standards, but they do not address the profound impact that community identification has on a student's ability to adapt. Negative interactions with teachers may affect a student's experience, but wouldn't specifically focus on the broader context of belonging and cultural integration that is essential for successful adjustment. Hence, the correct choice emphasizes the importance of social and cultural alignment in a student's school journey.