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rampuria
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dindin890
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Why is it not matters of concern but a matter of concern when there are two subjects?
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Dindin890, it can definitely be a good idea to think carefully about whether the plural subject ("pollution and degradation") can be a (singular) "matter of concern." The GMAT does mess with that sort of thing sometimes.

However, it's not a hard-and-fast rule: a plural subject can sometimes combine to form a singular noun, under the right circumstances.

  • Steph, Draymond, and Klay are an outstanding team. (10 bonus points for anybody who knows who Steph, Draymond, and Klay are!)
  • Intellectuals, generals, and merchants form the ruling class in Pelmenistan.

So this can be OK, depending on the meaning of the sentence.
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