问题描述：
[单选]
（英英释义）In aviation， it is mandatory to correctly understand maintenance and operation documentation to make sure that systems operate safely and correctly and to protect human lives．
A．In aviation, users must correctly understand maintenance and operation documentation in order to ensure systems operate safely and correctly and to protect human lives.
B．In aviation, it is possible to correctly understand maintenance and operation documentation to make sure that systems operate safely and correctly and to protect human lives.
C．In aviation, it is a must to correctly understand maintenance and operation material to make sure that systems operate with troubles and correctly and to protect human lives.
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