GMAT Sentence Correction (SC) | Re: The kindergarten teacher had the children in the class gathe

The correct answer is (E). A plural subject requires a plural verb. Since “snowflakes” is plural, its verb must be plural as well. (D) and (E) correct this error, but (D) would need a connector like "as" ("to justify the labeling of them as unique"). E is therefore correct.

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