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【单选题】
听力原文：W Hi, this is Estelle in the research department. Our power went out, and I think it's the entire floor. M O.K. What floor are you on? W We're on the seventh floor. It went out about five minutes ago. Everything was fine before that. M They're doing some rewiring on the eighth floor. I bet they hit something. I'll call them and see what's going on, and I'll call you after I find out. What's your extension? What is the problem?A.
The printers are not working.
B.
The electricity is not working.
C.
The doors to the building are locked.
D.
Important research papers were not received.
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