\The correct pair of words to complete the conversation is C. mi, tuJuan says: "Mi hermano pesa 65 kilos." ("My brother weighs 65 kilos.")Valeria says: "Y mi hermano pesa 70 kilos." ("And my brother weighs 70 kilos.")Juan then says: "Entonces, ____ hermano pesa menos que ____ hermano." ("Then, ____ brother weighs less than ____ brother.")Since Juan is referring to his own brother first, he uses "mi" (my). When referring to Valeria's brother, he uses "tu" (your) because he is speaking directly to her.