23. Nancy:David, can I give you a hand with one of your grocery bags?
David: Sure, Nancy. Could you take this one, please? These bags are really heavy.
Nancy:Why did you buy so much stuff when you have to walk home from the store? _______ 
David: My friends just came back home from Europe, and I’m inviting them for a welcome-home dinner.
(A) What’s for dinner?
(B) What’s your problem?
(C) What’s the occasion?
(D) What’s a recipe book?