The right answer is D. Annelids.
Annelids are protostomial vermiform organisms measuring between 0.5 mm and 3 m long. They have a body of cylindrical section, with a symmetry bilateral and metamerized, that is to say, which seems composed of a series of identical rings.
Sometimes with teeth or chitinous jaws, the mouth is at the level of the prostomium, the first segment, while the anus is on the pygidium, the last segment. Between the two, the body contains a straight digestive tract and a closed circulatory system.
