Many vessels are provided with flume tanks，which also have a dump tank located under the flume tanks. In the event the ship is damaged，you could dump the flume tanks into the dump tank which would （).

A.Reduce the free surface effect and raise the KG

B.Not have any effect on free surface and raise the KG

C.Reduce the free surface effect and lower the KG

D.Not have any effect on free surface and lower the KG

请帮忙给出正确答案和分析，谢谢！

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