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.