The correct option is D Housefly
Nereis, Pheretima (earthworm) and leech are annelids. House fly is an arthropod. Annelids are devoid of exoskeleton. But exoskeleton is a characteristic feature of arthropods. The skeleton outside their body or exoskeleton is made up of chitin which is a type of carbohydrate. It is impermeable to water and protects the insect from desiccation or drying up.