Read the sentence. The college cafeteria, which is free for all full-time faculty, is a popular and safe environment for students to study. Which part of the sentence is a nonrestrictive clause?

The clause “which is free for all full-time faculty” adds extra information about the college cafeteria; it does not identify which cafeteria the sentence means. The commas around it mark it as nonrestrictive, so choice B is correct.

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