Hint: On the underside of the body, the mouth contains a complicated dental apparatus called the lantern of Aristotle, which may also be venomous.
Sea urchin, is considered to be one among the 950 dwelling species belonging to spiny marine invertebrates (phylum Echinodermata, class- Echinoidea,). It has a globular frame with a radial organ which is proven by 5 bands of pores which are extending from mouth region to anus area. The tube feet are slender, extensible and sucker like are responsible for locomotion There are five carbonated jaws or teeth present around the mouth, they have a fleshy, tongue kind of floor within. The whole chewing organ is referred to as the "lantern of Aristotle."
The bilateral symmetry substituted by the adult's five-fold radial symmetry is an unusual feature of sea urchin development. The mesoderm and small micromeres are established during cleavage. At the end of gastrulation, cells of these two forms form coelomic pouches. In the larval stages from the left coelomic pouch, the adult rudiment develops; after metamorphosis, the rudiment extends into the adult. Before the egg is fertilised, the animal-vegetal axis is created.
Hence, the correct answer is option (C)
Note: Aristotle's lanterns are teeth which are usually used to scratch algae and other food. Some of the urchins also use it to make hiding places in corals and rocks. Sea urchins typically live on rough surfaces on the ocean floor and use the feet or spines of the funnel to navigate around. In addition, there are a few carnivorous species described.