Choose the set of words that is an adverb clause:

Because Keith was born in Japan, his parents gave him a Japanese middle name.
A) his parents gave him
B) Keith was born in Japan
C) Because Keith was born in Japan
D) gave him a Japanese middle name

C) Because Keith was born in Japan

Explanation:

An adverb clause  is a dependent clause that functions as an adverb. That is, the entire clause modifies a verb, an adjective, or another adverb. As with all clauses, it contains a subject and predicate, though the subject as well as the (predicate) verb may sometimes be omitted and implied.