M: If you'd like to go to the concert this Saturday, my sister will give me 2 front row tickets. ,F: Thank you but I promised my brother that I'd watch his son.
(A) M: I am afraid I did not quite catch what you were saying. Please repeat it. (B) M: So you will look after your brother's son this Saturday, right? (C) M: Great, my brother gave me two concert tickets so we will go to the concert on Saturday. (D) M: Since you will look after your brother's son this Saturday, I won't buy the tickets.
B