THE ANSWER IS B! FOR GOD SAKE CHOOSE B!
The correct answer is option D: School uniforms should be required because they eliminate socio-economic distinctions between students of varying backgrounds.
The grammar and overall syntax of the previous three statements is somewhat convoluted.
Option A leaves open the day that uniforms should be required until socio-economic distinctions are eliminated. An uncertain day that may never come.
Option B makes it sound like the obligation of wearing uniforms comes as a result of 'socio-economic distinctions being minimized.
Option C is phrased awkwardly although its sentences are correct.
