How does an adverbial clause differ from an adjective clause?

A. An adverbial clause describes a person, place, or thing, while an adjective clause describes an action.

B. An adverbial clause modifies a verb, while an adjective clause modifies an adverb.

C. An adverbial clause describes how, when, where, or why an action is performed, while an adjective clause describes or gives more information about a noun or pronoun.

D. An adverbial clause is always placed before the main clause, while an adjective clause is always placed after the main clause.