Select the adverb clause to complete the sentence. oscar was born in mexico city a.) , and he speaks spanish fluently. b.) , which has a fascinating history. c.) about thirty-five years ago. d.) although today he lives in texas. i'm thinking c.

C.) about thirty-five years ago.

Adverb clauses modify verbs, adjectives or other adverbs. They often answer the questions when, where, why, how. In looking at the options, the only option that answers one of these questions is C. It answers the question When?