单项选择题

M: What’s all that noise It sounds as if it’s coming from next door. The Nelsons aren’t back yet, are they
W: I don’t think so. It must be the window-cleaner working upstairs.

Where does the woman think the noise is coming from().

A. From upstairs.
B. From next door.
C. From the Nelsons’ house.
D. From the back door.