A. The region is not in itself a water producing area
B. In the north, several large tributaries join the Indus
C. The Jhelum Chenab, Ravi and Sutlej flow in to it from the east and the Kabul, Swat, Kurram and Gomel descend from the western ranges
D. All of the above
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The correct answer to the question: "The Indus plain problems is / are:" is "All of the above".