The artist's work was influenced by the art he saw in India while he was vacationing there with his wife and family.
Which is the adverb clause from this sentence?
A) with his wife and family
B) by the art he saw in India
C) while he was vacationing there
D) The artist's work was influenced
The answer is C. Since an adverb describes either an adjective, another adverb, or a verb, the word "while" is describing the action which is "he was vacationing."