Answer:
An appositive is:
B) a word or phrase that describes or renames a noun or pronoun.
Explanation:
An appositive can be described as a noun or noun phrase that is placed beside another noun or noun phrase in order to rename it. In other words, an appositive gives further information about the noun or phrase it changes. Appositives that are non-restrictive are set off by commas, while restrictive appositives are not. Therefore, the best option is B) a word or phrase that describes or renames a noun or pronoun.