单选题A man aboard a vessel，signaling by raising and lowering his outstretched arms to each side，is indicating（）.Adanger，stay awayBall is clear，it is safe to passCthe vessel is anchoredDa distress signal
单选题
A man aboard a vessel，signaling by raising and lowering his outstretched arms to each side，is indicating（）.
A
danger，stay away
B
all is clear，it is safe to pass
C
the vessel is anchored
D
a distress signal
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