---I am going to Nanjing and stay there for a week.

---____________ you are there, would you please buy some books for me?

A．If

B．While

C．Since

D．As soon as

周某到某家具城购买家具，看中了甲公司生产的“352”号红木家具一套。周某与甲公司双方达成协议：价款8千元，周某预付订金4千元，甲公司保证三天内将货送到周某家。双方在“352”号家具上作了标记。当晚，家具城失火，该套家具被焚。本案应如何处理？______

A．由周某承担损失，周某应补交所欠货款4千元
B．由甲公司承担损失，甲公司应退还周某预付订金4千元
C．由周某、甲公司双方平均分担损失，周某不补交货款，甲公司不退还订金
D．主要由甲公司承担损失，周某也应适当承担损失