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Which risk increases when a ship exceeds its roll period?

A)Parametric resonance induces amplification
B)Metacentric height sharply decreases
C)Righting arm becomes extremely short
D)Wave cancellation ceases effectiveness

💡 Explanation

Parametric resonance amplifies roll motion if its forcing frequency matches the encounter frequency, because natural stability contributes excess motion during forcing increases rather than resistance causing instability; therefore, capsizing risk rises, rather than reduced stability alone.

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