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Which sentence contains an adverb clause?

ASandy, who is never hopeful, didn't think Mom's plan was going to work.
BShe planned to piece the shreds together and repair the book.
CWhen we go to the store, we might have to buy Billy a new book.
DMom is someone who always looks on the bright side.

Verified Answer :

An adverb clause has essentially the same function as an adverb. "When" in c is key to it being an adverb clause.

An adverb clause is a subtype of subordinate/dependent clauses, meaning that it cannot exist on its own, outside of the main, independent clause. In these examples, there are several dependent clauses, in A, C, and D, however, only in C there is an adverb clause 'when we go to the store'. 
In the other examples, there are only adjective clauses.
So, the correct answer is C.