What is the problem with Russias space station？A．It has lost its primary 6xygen sources.B．

What is the problem with Russias space station？

A．It has lost its primary 6xygen sources.

B．It has lost its backup oxygen sources.

C．It has lost both the primary and the backup oxygen sources.

D．It has last neither the primary or the backup oxygen sources.

请帮忙给出正确答案和分析，谢谢！

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