【开放英语4(英语II(2))-1162网上形考机考题库】 —Could I speak to Don Watkins, please

【开放英语4(英语II(2))-1162网上形考机考题库】 —Could I speak to Don Watkins, please?
—____________.
A. I’m listening
B. Oh, how are you?
C. Speaking, please.
D. I’m Don.