Discussion
Assertion (A): Slightly coarser borrow material often outperforms an exact grain size match.
Reason (R): Coarser sediment remains on the active profile longer than finer material does.
Answer: C
Both are true and the reason gives the advantage, and the profile also stands slightly steeper. The gain must be set against the usually higher cost of coarser material. Grain size is the first thing checked in a borrow study.
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