GMAT Sentence Correction (SC) | Re: As rainfall began to decrease in the Southwest about the

Hi Kinjal,

Thanks for posting your doubt here.

On GMAT, "where" is used to refer to place. But "clans" are not any place. They are group of people. Hence, we need "who" to refer to them. This is the reason why use of "where" is incorrect in Choices B and C.

You are also correct in your analysis of the pronoun "they" in Choice "C" as it is unclear whether it refers