In a diesel engine, a cylinder liner should be replaced if it is ___________ⅠScuffed ⅡScored

A.I only is correct

B.Ⅱ only is correct

C.both I and Ⅱ are correct

D.neither I or Ⅱ are correct

请帮忙给出正确答案和分析，谢谢！

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