Read the sentence. The entire first period class agreed that yesterday’s algebra homework which the teacher assigned was a really fun challenge. How should the writer revise the punctuation in the sentence so that it is grammatically correct?

“Which the teacher assigned” adds extra information about “yesterday’s algebra homework”; it does not identify which homework the class meant. A nonrestrictive clause is set off with commas, so the sentence should read “…yesterday’s algebra homework, which the teacher assigned, was a really fun challenge.” The correct choice is “Insert commas around ‘which the teacher assigned’ because it is a nonrestrictive element.”

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