Answer: C) The necklace was a perfect complement to her outfit.
Explanation: A compliment is a polite expression of praise or admiration. A complement is a thing that contributes extra features to something else in such a way as to improve or emphasize its quality. From the given options, the sentence that uses the underlined word correctly is the corresponding to option C: The necklace was a perfect complement to her outfit (the necklace added an extra feature to her outfit).