The correct option is B Balram nadi
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If a boat is moving towards the flow of the river, its right side will be called right bank of the river and its left side will be called left bank of the river. Here the heights are decreasing from East to West along the Banas river and hence the direction of the river is from East to West. So if this is the direction of flow of the river then this side will be its left bank and its left bank tributary will be Balram nadi.