The correct option is C Shark
Animals are grouped into chordates and non-chordates on the basis of presence or absence of notochord. The notochord is a rod-like supporting structure present on the dorsal side of all chordates. The notochord is absent in non-chordates. Shark is a chordate as it has notochord. Snail, starfish and sea urchin are examples of non-chordates.