Which of the following can be a potential problem during aerial installations of fiber-optic cables?

Falling branches can be a significant concern during aerial installations of fiber-optic cables. These installations often take place in environments where cables are strung between poles or other supports, which may be close to trees. Strong winds or storms can cause branches to break or sway, potentially damaging the cables or affecting their integrity. This risk is particularly important to consider because damaged cables can result in service interruptions, requiring repairs that could be costly and time-consuming.

While extreme temperatures, excessive fiber usage, and inadequate cable length do present challenges in the general context of fiber-optic installations, the immediate and tangible concern specific to aerial installations relates to the environmental factors like falling branches that can physically impact the infrastructure more directly.