F: Tom, would you come here to help me clean the dining room? Your sister is busy in the garden. ,M: Sorry, Mom. I'm doing my homework now.
(A) F: Your sister is doing her homework. That's why I want you to do gardening. (B) F: Why do you and your sister do homework while I want you to clean the dining room? (C) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (D) F: I want you to do your homework. Your sister has just finished her homework and is cleaning the living room.
C