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Which risk was increased when early suspension footbridges used untreated hemp ropes?

A)Catastrophic span collapse at midspan
B)Excessive deck oscillations in storms
C)Accelerated galvanic corrosion of anchors
D)Unpredictable thermal expansion incidents

💡 Explanation

Untreated hemp absorbs moisture, promoting internal ROT of the rope through microbial action. This reduces tensile strength; therefore, span collapse is probable rather than oscillation, galvanic corrosion or thermal effects which have different moisture dependence.

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