Question

Which word signals a nonrestrictive clause in a complex sentence?

Answer 1

Nonrestrictive clauses are those which are set off by commas from the rest of the sentence. I'd choose the answer which<em /> as the correct one, because yet introduces independent sentences, and that and while introduce restrictive clauses. 
For example:
The price, which was very high for me, was quite reasonable for Frank.

Answer 2

Answer: the answer is which

Explanation:

i know this because i took the test and got the answer correct