Answer:
Adverbial clause
Explanation:
An adverbial clause is a subtype of dependent clauses and it functions as an adverb in a sentence. Usually, it has both a subject and a verb.
In this case, we have an<em> adverbial clause of concession </em>marked with subordinating conjunction<em> even though</em>. Some other conjunctions used in this type of clause are: after, if, although, unless, so...that, as if, since...
Besides the adverbial clause of concession, we have also the adverbial clauses of time, place, manner, comparison, purpose...
