Respuesta :
The answer is D.one subordinate clause only because its incomplete thought.
The answer to your question would be that in the selected group of words there is one subordinate clause only. That is, the correct option would be D.
A subordinte clause, also known as dependent clause, will begin with a subordinate conjunction or a relative pronoun and will contain both a subject and a verb. They are called dependent because they depend on a main clause since they do not represent a complete thought, and thus cannot stand alone as a grammatically correct sentence.