Answer:
The sentences that contain an adverb clause are sentences 1 and 2.
Step-by-step explanation:
Adverb clauses, also called adverbial clauses, are dependant clauses that function as adverbs. As such, they modify adjectives, another adverb, or verbs. What is more, as adverbial clauses are dependent clauses, they must contain a subordinating conjunction to connect them to the rest of the sentence. In the sentences above the adverbial clauses are the following ones: "Because she enjoyed painting" (1) and "as Aaron was having a midnight snack" (2). The subordinating conjunctions that introduce the clauses are "because" and "as".