单项选择题

A vessel is underway with a work stage rigged over the side. A seaman may work on the stage，but only when（）.

A.wearing a life jacket
B.wearing a safety harness secured to the stage
C.wearing both a life jacket and a safety harness secured to the stage
D.the vessel is not making way

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救助合同与救助公约

A vessel is underway with a work stage rigged over the side. A seaman may work on the stage，but only when（）.