<em>Adverbs</em> refer to the words which modify the verb, adjectives or adverbs, expressing a relation of a cause, time, place and so forth.
Whereas, an <em>adverb clause</em> refers to the group of words which works as an adverb. An adverb clause begins with the subordinating conjunction such as if, although, because and so forth. Lastly, it includes subject and predicate.
In the following options, the sentence which contains adverb clause is 1) Darla set up a studio because she enjoyed painting.
An adverbial clause in the above sentence is 'because she enjoyed painting.'
The above sentence contains a subordinate conjunction 'because' and has a subject 'Darla set up a studio' and predicate 'because she enjoyed painting.'