Question

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

Explanation:

A restrictive phrase is essential to the meaning of a sentence as it limits or defines the noun it modifies. Non - restrictive phrases are not necessary for the basic meaning and are set off by commas. Relative phrases can be either restrictive or non - restrictive. Appositive phrases rename a noun and are often non - restrictive.

Answer:

A. restrictive