Which observation would indicate subterranean termite activity on wood?

• A. Mud Tunnels
• B. Honeycombs
• C. Webbing
• D. Rotted Odor

Answer: (A)

Subterranean termites need moisture from soil, so they construct protective mud tunnels to travel from the ground into wooden structures. Finding mud tunnels on wood or along foundations is a clear indicator that these termites are active, because the tubes are specifically built to maintain humidity while they forage and feed. The other observations don’t fit this pattern: honeycombs point to bees, not termites; webbing isn’t a typical sign of termite activity; and a rotted odor signals decay from moisture or fungus, not direct termite movement. So mud tunnels are the best clue that subterranean termites are at work.