【单选题】

Speaker A: Hi. Excuse me, ...um ... do you need any helpSpeaker B: ______
A．Yes, but are you sure you can help me

B．Oh, yes. Do you have tennis shoes
C．Well, I'd like one chicken burger and a cup of coke, please.
D．Oh, yes, I do. I've been walking around in circles. I can't seem to find the train station.