单项选择题

When pushing ahead，wires leading from the quarters of the after outboard barges to the bow of a towboat（）.

A.prevent the towboat from sliding when the rudder is moved
B.prevent the barges from spreading out when backing down
C.hold the towboat securely to the barges
D.prevent the sidewise movement of the face barges

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狭水道、冰区与运河航行

When pushing ahead，wires leading from the quarters of the after outboard barges to the bow of a towboat（）.