Which of the following is a sign of previous termite damage?

Identifying signs of previous termite damage is crucial for assessing the potential risk to structures. The presence of old or new mud tubes is a clear indicator of termite activity. Termites construct mud tubes as a protective measure, allowing them to travel safely between their colony and their food source, primarily wood. The presence of these tubes suggests that termites have historically inhabited the area, indicating past or ongoing damage to the wood in proximity to these structures.

Other options do not signify prior termite damage. Clean wood without any signs might suggest that the wood has not been compromised, and visible paint over the surface might simply conceal underlying issues rather than indicate them. Brightly colored areas could be a result of water stains or other superficial issues but do not specifically denote the presence of termite activity. Thus, identifying mud tubes effectively confirms past or current termite infestations and is vital for those involved in pest control and building maintenance.