Discussion
Assertion (A): Many major deltas are now retreating rather than advancing.
Reason (R): Upstream dams and diversions have cut the sediment supply reaching the coast.
Answer: B
Both are true and the reason gives the principal cause, and subsidence and sea level rise add to the problem. The Nile, Mississippi and Indus deltas are all documented examples. Subsidence compounds the loss of sediment supply.
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