M: I have looked everywhere for the sign up sheet for next week's Field Trip. Have you seen it, Matilda? ,F: I saw it yesterday. But I'm not sure where it is now, and I don't know whether I'll be able to join you.
(A) M: I am still not sure about when I can take the field trip. (B) M: I want to know about where the sign-up sheet is, so we can go to the field trip together. (C) M: I am still not sure about where the sign-up sheet is. (D) M: I’m sorry, I didn’t catch that. Would you mind speaking more slowly?
C