Concept:Tapeworms live inside the sheep’s digestive tract, so they must be controlled by giving medicine orally.
Explanation:Tapeworms are internal parasites found in the intestines of sheep.
Drenching means forcing a liquid medicine into the animal’s mouth so it reaches the stomach and intestines.
This liquid preparation kills internal parasites such as tapeworms.
Dipping is used to control external parasites like ticks and lice by soaking the animal in a chemical solution.
Spraying also targets external parasites by applying chemicals onto the skin or wool.
Dusting applies powders on the body surface and is not effective for internal worms.
Among the given options, drenching is the only method that administers the drug internally.
Answer:D. drenching