The correct answer is 'Sentences A and C' are expressing the meaning of the given word. Repartee: means 'conversation or speech characterized by quick, witty comments or replies.' In Sentence A: In this sentence the word 'Repartee' is correctly used, according to the meaning given above of Repartee, because two persons are indulged in witty conversations and giving a quick reply. 'witty' means humorous, clever. In Sentence B: In this sentence the word repartee is incorrectly used. Instead using 'repartee' use 'Besmirch' In Sentence C: In this sentence the word repartee is correctly used. One can take a hint from mega-mouth. So the correct answer is option 2.