Consider the following diagram : In which one among the following lett

Consider the following diagram :
In which one among the following lettered areas of the diagram would erosion most likely change the shapes of the riverbed ?

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This question was previously asked in

UPSC NDA-1 – 2015

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The diagram shows a meandering river. In a meandering river bend, water flows faster on the outer bank (due to centrifugal force and deeper water) and slower on the inner bank (where sediment is deposited, forming a point bar). Erosion is most active on the outer bank of the bend due to the faster current. Area C is located on the outer bank of the river bend where erosion is dominant, leading to the cutting away of the bank and changing the shape of the riverbed and bend over time. Areas A and D are on the inner bank where deposition occurs. Area B is likely in a straighter section or near the transition, but erosion is most pronounced at the apex of the outer bend, which is represented by C.

Erosion in a meandering river is concentrated on the outer bends where water flows fastest, while deposition occurs on the inner bends where water is slower.

Over time, continuous erosion on the outer bends and deposition on the inner bends cause the meanders to migrate laterally across the floodplain and can eventually lead to the formation of oxbow lakes when a meander neck is cut off.

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