Answer: D) A noun clause is a dependent clause that does not modify a noun or a pronoun.
Explanation: A noun clause is a dependent clause (it doesn't have complete meaning on its own) that acts as a noun. Noun clauses begin with words such as how, that, what, whatever, when, where, whether, which, whichever, who, whoever, whom, whomever, and why. Noun clauses can act as subjects, direct objects, indirect objects, etc. As it acts like a noun, it doesn't modify a noun or a pronoun.