Final answer:
To detect a powder post termite infestation, look for wood-colored fecal pellets. Powder post termites leave behind these pellets, differing from termites that create mud tubes. Mud tubes with pellets are not indicative of powder post termite activity.
Step-by-step explanation:
To determine an infestation of powder post termites, look for B. Pellets, which are small, wood-colored fecal droppings.
These termites leave behind tiny, round pellets, typically found in small piles beneath infested wood.
Unlike subterranean termites, powder post termites do not create mud tubes, so the presence of mud tubes, option A, would indicate a different type of termite activity.
The option C, mud tubes with pellets in it, is not characteristic of powder post termite infestation.
When inspecting for powder post termites, check for pellets, fine powder or sawdust-like material near cracks or holes in wood surfaces as this is a telltale sign of their presence.