Answer:
Adverb clauses is the correct answer.
Step-by-step explanation:
The term adverb clause refers to a group of words that function as an adverb in a sentence so these clauses can describe or modify adjectives, verbs, and other adverbs. Adverb clauses are used to add information related to when, where, why, how, how much or under what condition the action in the sentence happens. They are introduced by subordinating conjunctions.