单项选择题
Preventer bars are fitted on lifeboat releasing hooks to prevent（）.
A.the falls from unhooking if the releasing gear is operated accidentally while the boat is being lowered
B.operation of the release lever until the boat is waterborne
C.the falls from rehooking after they have been released
D.accidental unhooking when the falls become slack
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A.be painted bright red
B.be secured to a permanent part of the lifeboat structure
C.have the area surrounding the lever painted white
D.All of the above -
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