单选题You are underway and pass by a lighthouse. Its light，which was white since you first sighted it，changes to red. This means（）.Athe light is characterized as alternately flashingBthe lighthouse has lost power and has switched to emergency lightingCit is the identifying light characteristic of the lighthouseDyou have entered an area of shoal water or other hazard
单选题
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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