单项选择题
How do the height and location of a tug’s towing bitts relate to the danger of tripping?（）
A.The further forward and closer to amidships the more readily the tug will trip
B.Placement further aft permits more effective pulling，better steering and eliminates the danger of tripping
C.Installing the bitts down low lowers the center of gravity
D.The height and position of towing bitts has no significance
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