Discussion
Assertion (A): Groynes are usually built in a field rather than singly.
Reason (R): A single groyne creates a sharp discontinuity and severe erosion beside it.
Answer: A
Both are true and the reason gives the reason for the practice, and a field spreads the effect. Tapering the field at its downdrift end reduces the discontinuity further. A single groyne creates a sharp erosion step beside it.
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