Question

read the definitions.
com = with
ple = to complete
pli = to be courteous, to comply with
-ment = an action or object
which sentence uses the underlined word correctly?
the silk curtains were a nice compliment to the tall windows.
she appreciated his effort and paid him a nice complement.
the necklace was a perfect complement to her outfit.
the design of the building complimented its intended purpose.

Explanation:

• "Complement" (from ple = to complete, com = with) means something that completes or pairs well with another thing. The necklace completing the outfit fits this definition.
• "Compliment" (from pli = to be courteous) means a polite praise, which is incorrectly used in the first option. The second option incorrectly uses "complement" when referring to praise, and the fourth option incorrectly uses "complimented" to mean matching a purpose instead of using "complemented".

Answer:

C. The necklace was a perfect complement to her outfit.