GMAT Sentence Correction (SC) | Re: The rain has flooded drainage canals in many orange-tree gro

which always modifies thenearest grammatically eligible word. So, in A and B,which modifiesorange-tree groves , suggesting thatorange-tree groves caused the fruit to fall; however, from the context, it is clear thatflooding of drainage canals caused the fruit to fall.

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