From the passages, we observe that living bridges and suspension bridges both provide dry routes over water. The Option D.
Living bridges, crafted by the Khasis tribe in India, are constructed using natural materials specifically the roots of the ficus tree. These unique bridges are ingeniously grown over bodies of water and ravines by encouraging the secondary root system of the ficus tree to extend outward.
Suspension bridges are engineered marvels that also offer dry passages over water. They are constructed using materials like steel and concrete, designed with long, straight sections between towering supports, and supported by suspension cables that distribute the load to the ground.