Which group is most prevalent in American schools,based on Adler and Adler's research on peer culture?

Question

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Adler and Adler's research on peer culture in American schools identifies middle friendship circles as the most prevalent group. These circles consist of students who are not necessarily the most popular or the most isolated but have a stable social standing and friendships within the school environment.

Which Group Is Most Prevalent in American Schools,based on Adler