单选题 Speaker A: Haven' t I seen you somewhere before?
Speaker B: No, I don't think so.
Speaker A: But your face is so familiar. Wait a second... I know... We were on the same flight to New York last month.
Speaker B: Oh, yes. Now I remember. What a coincidence to meet in San Francisco!
Speaker A: Well, you know what they say —______.
A. the world is small B. the world is little
C. it's a small world D. it's a little world