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【单选题】
我与德商签订一笔进口机器零件的合同。合同签订后,德商的两家工厂都投入了生产。在生产过程中,两家工厂之一由于意外事故遭火灾,完全丧失了生产能力,德商( )
A.
因遇不可抗力事故，可要求解除合同
B.
因遇不可抗力事故，可要求延期履行合同
C.
因遇不可抗力事故，可要求延期履行合同，但我索赔的权利
D.
不属于不可抗力的范围，我方应要求德商按期履行合同
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