单选题A head on situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and （）.Aone sidelight and the masthead light are visibleBthe vessels will pass closer than half a mileCboth vessels sound one prolonged blastDboth sidelights and masthead light(s) are visible
单选题
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
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