Which of the following causes the formation of surf on a breaking wave?

Question

Beach erosion
Low wind speeds
Deposition of sand on a beach
Friction with the ocean bottom at the coast

is it d pls help me

Answer 1

Well, yes sort of

as a deep water wave approaches shallow water it slows down, not really due to friction but due to the theoretical velocity of waves in deep and shallow water.
In deep water
V = k sqrt (wavelength)
in shallow water
V = K sqrt (water depth)

the transition from deep to shallow starts when the depth is about half a wavelength
The waves therefore slow down. Since the same number land per minute, that means shorter and steeper.
Therefore I would pick D as the closest to a correct answer, but whoever wrote the question did not know a lot about ocean surface waves.