Discussion
Progressive failure of a rubble mound typically begins with
Answer: D
Correct answer: displacement of a few armour units exposing the underlayer
Failure begins locally. A few units are moved by a storm, the smaller underlayer material beneath them is exposed to direct wave attack, it washes out rapidly, and the hollow that forms undermines the units around it - so the damage spreads from the initial patch. Catching it at that stage, by survey and prompt repair, is far cheaper than the reconstruction that follows if it is left.
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