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