An appositive phrase is a word group that replaces a noun or pronoun renames a noun or pronoun indicates which one or what kind functions as the indirect object of a verb

Appositive phrases are always separated from the rest of the sentence using commas. Appositives usually feels like an interruption in a sentence. Appositives can also be found at the end and beginning of the sentence other than the usual middle. You know that it's an appositive if when you remove that part of the sentence, you are still left with a complete idea. The most probable answer is then B. renames a noun or pronoun