Answer:
O B. because it is joined to a sentence by a subordinate conjunction.
Step-by-step explanation:
An independent clause, on the other hand, can stand on its own as a complete sentence and needs no other clauses to be complete.
A dependent clause is a group of words or phrases that do not complete a thought and cannot stand on its own as a complete sentence. It needs an independent clause to be a complete sentence. Moreover, it also needs a subordinating conjunction to be joined to the main clause.
A dependent clause is also known as a subordinate clause because it is joined to a sentence by a subordinate conjunction. Thus, the correct answer is option B.