GMAT Critical Reasoning (CR) | Re: Differences in clothing can serve to highlight differences in

D: Schools that require students to wear uniforms in school are located in less affluent communities.

In other words, for an entire school:

more affuent - no uniforms

less affluent - uniforms

So, D indicates that while wearing uniforms results in financial means no longer being highlighted by clothes within a school, uniforms highlight differences in financial means between student
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