单项选择题
You are underway and pass by a lighthouse.Its light，which was white since you first sighted it，changes to red．This means（）.
A.The light is characterized as alternately flashing
B.The lighthouse has lost power and has switched to emergency lighting
C.It is the identifying light characteristic of the lighthouse
D.You have entered an area of shoal water or other hazard
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While your vessel is docked port side to a wharf，a sudden gale force wind causes the vessel’s bow lines to part.The bow begins to fall away from the dock，and no tugs are immediately available.Which measure（s）should you take FIRST（）.
A.Call the Master and the deck gang
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C.Let go the starboard anchor
D.Obtain assistance and attempt to put some new bow lines out
