How Do Sand Dunes Help Maintain Sand on a Beach

How do sand dunes help maintain sand on a beach?

A) Sand dunes stop the landward advance of the waves.
B) People build their houses on top of them, thereby keeping the highest part of the barrier island intact.
C) Eroding dune sand spreads over the beach and takes up wave energy.
D) Sand dunes don't have much effect; they merely look picturesque.
E) They don't help maintain sand on a beach.

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