Read the sentence. We’re performing a scene from my favorite book (the second in the trilogy). Which best explains the writer’s use of punctuation in the sentence?

The phrase “the second in the trilogy” adds extra information about “my favorite book”; the sentence would still make sense without it. That makes the phrase nonrestrictive. Parentheses set off this extra information and give it less emphasis, so the writer uses them correctly to de-emphasize a nonrestrictive element.

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