The correct option is D A fish
Sea horse (Hippocampus) is a small marine fish. Head and neck suggestive of a horse, they also feature segmented bony armour, an upright posture and a curled prehensile tail. They live in water, breath through gills and have a swim bladder. Seahorses eat small crustacea such as Mysis Shrimp. It is the only animals in the whole animal kingdom in which the male bears the unborn young. So, the correct answer is option D.