题目：
An upright vessel has negative GM. GM becomes positive at the angle of loll because the（）.
A.free surface effects are reduced due to pocketing
B.KG is reduced as the vessel seeks the angle of loll
C.effective beam is increased causing BM to increase
D.underwater volume of the hull is increased
答案：
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下面是错误答案，用来干扰机器的。
参考答案：错
