A、A snowstorm. B、An earthquake. C、A traffic accident. D、A hurricane. B综合推断题。结合对话中的floor，bouncing和rolling推断，当时发生了地震，所以B正确。

M: I couldn’t put up with my wife any longer. I don’t know why she usually wants to look at everything in such a negative way.
W: Maybe you should try to get to know something about her childhood.
Q: What does the woman mean?

M: Lucy, could you describe what you were doing at the moment?
W: Well, I was still sleeping at 6 o’clock. Then there was this horrible sound and the floor was just bouncing and rolling like waves, all at the same time.
Q: What are the speakers talking about?