In which one of the following organisms are its excretory organs correctly stated?

The correct option is D. Earthworm - pharyngeal, integumentary and septal nephridia.

Nephridia are the excretory organs of earthworms, which are of three types, namely, septal, integumentary, and pharyngeal. A septal nephridium consists of a nephrostome or ciliated funnel that drains the coelom. The body of the nephridium consists of a short straight lobe and a long twisted lobe with a narrow apical part. Integumentary nephridia lie scattered in the body wall of each segment, except the first two. There are 200-250 nephridia in each segment, but on the clitellum, their number increases to 2000-2500 per segment, which is called the forest of nephridia. These nephridia lack nephrostomes, and their terminal ducts open on the body surface. Pharyngeal nephridia are located on either side of the pharynx and esophagus in segments 4-6. Ammonia and urea are the excretory products.