单项选择题

ASuccessoris（）.

A.Aneighborthathasmetthefeasibilitycondition
B.Aneighborthathasmetthefeasibilityconditionandhasthelowestcostpathtowardsthedestination
C.Anyneighborthatisinthepathtowardsthedestination.
D.Anyneighborthatisinthepathtowardsthedestinationandwhosereporteddistanceequalsthefeasibledistance

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