A. It includes the catchments of Kohat, Toi Kurran, Zhob-Gomel and small streams of the Quetta District
B. Since most of the catchments are poorly vegetated, there is a high degree of surface run-off from the land during the rain
C. Both (a) & (b)
D. None of these
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The correct answer to the question: "The western mountain region problem is / are:" is "Both (a) & (b) ".