Dear R26, I guess you mean the comma after the word “job”. When I look at the sentence, it seems not to be underlined. However, I don’t think you need to worry about this comma. The equations have reduced three things. The second and third thing must be separated by “and”. Whether there is a comma there or not doesn’t matter. Eliminate A, B and D. As mentioned, “was lowered” in E is redundant. Choose C. Fortunately, the GMAT is not a test of punctuation!
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