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Consider the following statements about the equilibrium profile concept.
1. It describes an average shape rather than an instantaneous one.
2. Its coefficient depends on sediment grain size.
3. A real beach matches it exactly at every moment.

  • A.1 and 2 only
  • B.3 only
  • C.1 only
  • D.All of them

Answer: A

The first two are correct and are how the concept is used. The third overstates it, since real profiles fluctuate about the equilibrium shape continuously without ever quite matching it. It is a useful design idealisation, not a description.

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