which word signals a nonrestrictive clause in a complex sentence? that which while yet

which word signals a nonrestrictive clause in a complex sentence? that which while yet
Answer
Brief Explanations:
In English grammar, 'which' is commonly used to introduce a non - restrictive clause in a complex sentence. A non - restrictive clause provides additional, non - essential information and is set off by commas. 'That' is used for restrictive clauses, and 'while' and 'yet' are not used to signal non - restrictive clauses in this context.
Answer:
B. which