Answer:
a. bridges suspended almost 100 feet off the ground
Step-by-step explanation:
It is difficult to determine exactly how high a bridge would have to be suspended above the ground to walk among the top canopy in a tropical rainforest, as the height of the canopy can vary depending on the specific location and the type of trees present. In general, however, the canopy of a tropical rainforest is typically found at a height of around 30-40 meters (100-130 feet) above the ground. This means that a bridge would need to be suspended at least this high in order to allow people to walk among the canopy. Keep in mind that this is just a general estimate, and the actual height of the bridge would depend on the specific conditions of the forest where it is located.