单项选择题

A towboat has the same draft as the barges it is pushing ahead. If the distance from the stern of the towboat to the head of the tow is 260m，where is the approximate location of the pivot point of the unit?（）

A.At the head of the tow
B.75m from the head of the tow
C.120m from the head of the tow
D.180m from the head of the tow

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