A dependent clause would need to follow an independent clause in order to stand on its own as a sentence. Thus the correct answer is A.
A group of words known as a dependent clause does have a subject and a verb but does not fully express a thought. It would require a separate clause to come after it.
A set of words that represents a comprehensive concept and has a subject and verb is called an independent clause. Combining an independent clause with a dependent clause is refer as subordination.
Therefore, option A is appropriate.
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