Identify the complex sentence from the choices below:

A. "Feasts must be solemn and rare, or else they cease to feast. " (Aldous Huxley)

B. "Tell the truth, work hard, and come to dinner on time." (Gerald R. Ford)

C. "You can put wings on a pig, but you don't make it an eagle." (Bill Clinton)

D. "Because he was so small, Stuart was often hard to find around the house." (E. B. White)

C. "You can put wings on a pig, but you don't make it an eagle." (Bill Clinton)

Explanation:

A complex sentence is one that contains a subordinate or dependent clause  that is joined by a coordinating conjunction.

From the answer above, the independent clause "You can put wings on a pig" is joined to the subordinate clause "you don't make it an eagle" by the coordinating conjunction "but"