GMAT Sentence Correction (SC) | Along the major rivers that traverse the deserts of

Along the major rivers that traverse the deserts of northeast Africa, the Middle East, and northwest India, the combination of a reliable supply of water
andgood growing conditions both encouraged farming traditions that, in places, endure in at least 6,000 years.

(A) good growing conditionsboth encouraged
farming traditions that, in places,endure in - Correct idiom is - Combination of X and Y. Use of both is incorrect. endure must be have endured to represent 6000 years. for should be
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