A (n) clause should always be separated from the rest of the sentence by commas.

dependent

independent

c nonrestrictive

d. restrictive

The awnser is C.) Nonrestrictive

A clause that is always be separated from the rest of the sentence by commas is called dependent clause. It’s a type of clause that cannot stand alone in a sentence, so they need to be combined with another clause e. g. main clause or independent clause. Because this clause can’t stand alone, it is always separated by commas.