Question

What is true of a non-restrictive clause?

Answer 1

A non-restrictive clause is always set off by one of more commas.
If you take a non-restrictive clause out of a sentence, the basic meaning of the sentence stays the same.
A non-restrictive clause is an incidental description thrown into the sentence.
all of the above

Answer 2

A nonrestrictive modifying clause (or nonessential clause) is an adjective clause that adds extra or nonessential information to a sentence. The meaning of the sentence would not change if the clause were to be omitted. Nonrestrictive modifying clauses are usually set off by commas.

Answer 3

So B?

Answer 4

I think so :)