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Which structural risk during siege increases as a rope bridge's span is lengthened to reach castle walls?

A)Shear stress concentrated at anchors
B)Torsional instability under soldier load
C)Material creep causing bridge sag
D)Resonance amplification during wind gusts

💡 Explanation

Increased span length makes shear stress concentration significant at anchor points because the load increases linearly with span, straining the materials, therefore, anchor failure is the outcome rather than torsional instability, dependent primarily on bridge width.

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