A man aboard a vessel，signaling by raising and lowering his outstretched arms to each side，is indicating（）.<br>A:danger，stay away<br>B:all is clear，it is safe to pass<br>C:all is clear，it is safe to approach<br>D:a distress signal

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:all is clear，it is safe to approach
D:a distress signal

出自：海船船员证

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