F: OK, boys. It's time that you learn how to do your own laundry. Who can tell me the first thing that you need to do? ,M: Separate the whites from the dark colours.
(A) F: Yeah, my brother, as your sister, I am very proud that you know the first thing is not to separate the whites from the dark colours. (B) F: Really? Separate the reds from the dark colours? Oh, as your teacher, I have to teach you how to do your own laundry. (C) F: I didn’t hear you. Please could you tell me again? (D) F: Yeah, my son. As you mom, I am very happy that you know the second thing is to separate the whites from the dark colours.
C