Question

a phrase is necessary to the meaning of a sentence. restrictive nonrestrictive relative appositive

Explanation:

A restrictive phrase provides essential information that defines or limits the noun it modifies, and is necessary for the sentence's meaning. Non - restrictive phrases are not essential and are set off by commas. Relative phrases are a type of dependent clause starting with a relative pronoun. Appositive phrases rename a noun but are not always essential.

Answer:

A. restrictive