Answer: F) all of the above.
Step-by-step explanation: A clause is the smallest grammatical unit that expresses a thought and it consists of a subject and a verb. A clause may be a main clause, when it forms a complete sentence standing alone, having a subject and a predicate; a subordinate clause, when it doesn't have complete sense on its own; a noun clause, when it acts as a noun; an adjective clause, when it describes a noun in a sentence; and an adverb clause, when it functions as an adverb.