A dependent clause Need in order to stand on its own as a sentence is an independent clause. 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 independent clause to come after it.
A group of words is known as an independent clause that has a subject, a verb, and conveys a complete idea. Subordination is the term used to describe the combination of two independent clauses.
Therefore, option A is appropriate.
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