Deep dissection by river valleys in the Peninsular Plateau is the result of which process?

Correct answer: Long term erosion

The direct answer is A: deep dissection by river valleys is the result of long-term erosion. A plateau is a raised area of land, but rivers can cut into it over a very long period. Running water removes soil and rock, deepens channels, and creates valleys, ravines and an uneven, dissected surface. The reasoning chain is: an old plateau remains exposed; rain and rivers repeatedly flow over it; flowing water erodes the surface and carries sediment away; continued erosion cuts deep valleys. Option A is correct because it identifies the main geomorphic process responsible for this worn and cut-up relief. Option B is wrong because sea tides act mainly along coasts and cannot explain deep inland river valleys across the Peninsular Plateau. Option C is wrong because avalanches require snow-covered, steep mountain slopes; they are not the normal process shaping this plateau. Option D is wrong because coral formation produces coral reefs or islands in suitable marine environments, not deeply dissected river valleys. The exam cue is simple: when a land surface is described as dissected by valleys, connect it with prolonged erosion by running water.