Please help me with this question!

The word which signals a nonrestrictive clause in a complex sentence is:

B. which

Explanation:

We can eliminate the two last options since "while" and "yet" are not words that initiate restrictive or nonrestrictive clauses. They can be a part of them but are not essential.

We are left with "that" and "which", both having similar uses. However, "that" can be used with restrictive clauses, but not with nonrestrictive ones. That is the reason why we chose "which" as the correct option above. A restrictive clause is a relative clause that provides essential information about a noun or noun phrase, limiting it. A nonrestrictive clause is set off by commas, and the information provided by it can be taken out without any harm to the meaning or the message being conveyed. Take a look at the examples below:

- The clothes that I bought online must be delivered tomorrow. (restrictive)

- The clothes, which were donated by Jen, were impeccably clean. (nonrestrictive)

the answer is culture