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Which risk increased for Inca rope suspension bridges when moisture content of the plant fiber reached its hygroscopic limit?

A)Material tensile strength degraded rapidly
B)Anchorage points experienced thermal expansion
C)Decking planks induced resonant vibration
D)Abutments suffered from accelerated erosion

💡 Explanation

When plant fibers reach their hygroscopic limit, the internal hydrogen bonding weakens due to water molecules disrupting fiber cohesion (hygroscopic decay); because tensile strength diminishes, critical ropes were prone to snapping; therefore fiber integrity dictated duration, rather than alternatives like pure load.

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