Explanation:

Braided channels occur in rivers with high slope when, threshold level of sediment load or
slope is reached, any slope over this threshold creates a braided stream. This is true for
Himalayan Rivers and so 1 is correct.
Flat valleys, like V-shaped valleys, are formed by streams, but they are no longer in their
youthful stage, and are instead considered mature. With these streams, as the slope of a
stream's channel becomes smooth, and begins to exit the steep V or U-shaped valley, the
valley floor gets wider. Because the stream gradient is moderate or low, the river begins to
erode the bank of its channel instead of valley walls. So, 2 is correct as it is found in
Himalayan rivers.
An oxbow is a crescent-shaped lake lying alongside a winding river. The oxbow lake is
created over time as erosion and deposits of soil change the river's course. This is found in
bank eroding Himalayan Rivers. So, 3 is correct.