If two or more ppl answer. You pick one
B.when an action is done
when an action is done to it when it is describing the verb when it possesses something when it is doing the action.
Noun clauses are dependent clauses that can replace any noun in the sentence: subjects, objects, and/or subject complements. In all, there are five different functions that a noun clause can serve: subjects, direct objects, indirect objects, objects of the preposition, and subject complements.J