A head on situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and （）.<br>A:one sidelight and the masthead light are visible<br>B:the vessels will pass closer than half a mile<br>C:both vessels sound one prolonged blast<br>D:both sidelights and masthead light(s) are visible

A head on situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and （）.
A:one sidelight and the masthead light are visible
B:the vessels will pass closer than half a mile
C:both vessels sound one prolonged blast
D:both sidelights and masthead light(s) are visible

出自：海船船员证

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