When it comes to complex sentence and introducing a nonrestrictive clause the word used is:
B. Which
What are complex sentences?
A complex sentence is formed by joining an independent clause and a dependent one. A dependent clause needs the independent one to give it context, so that it makes sense. It does not express a complete thought on its own.
What are nonrestrictive clauses?
A nonrestrictive clause is set off by commas and signaled by the use of "which." The information provided by it can be taken out without any harm to the meaning or the message being conveyed.
Example: The clothes, which were donated by Jen, were impeccably clean.
Learn more about complex sentences here:
https://brainly.com/question/17538242
