【单选题】
A A vessel proceeding along the course of a narrow channel or fairway shall keep as near to the outer limit of the channel or fairway which lies on her starboard side at all times.
B A vessel proceeding along the course of a narrow channel or fairway shall keep as near to the outer limit of the channel or fairway which lies on her starboard side as is safe and practicable.
C Any vessel shall, at all times, avoid anchoring in a narrow channel.
D A vessel of less than 20 metres in length or a sailing vessel shall not impedethe passage of any other vessel navigating within a narrow channel or fairway
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