Discussion
Assertion (A): Rubble mound breakwaters are designed to sustain some damage.
Reason (R): A structure designed for no movement at all would be prohibitively expensive.
Answer: C
Both are true and the reason gives the economics, and the damage level is chosen explicitly. Stability formulae are written in terms of that accepted damage rather than of no damage at all. Zero movement would demand impractically heavy units.
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