The correct answer is option 2: Shark and Ray. Cartilaginous fish are a type of fish that have skeletons made of cartilage instead of bones. Sharks and rays both belong to the cartilaginous fish group. These fish have a flexible and strong cartilaginous skeleton that provides support for their bodies. Sharks, like the great white shark, are known for their sharp teeth and powerful jaws, while rays, like the manta ray, have flat bodies and usually have a long tail with venomous spines. Option 1, Tuna, and option 3, Skates and Hilsa, are not examples of cartilaginous fish as they have skeletons made of bones. Option 4, Eel, is also not a cartilaginous fish as it has a long, snake-like body and a skeletal structure made of bones.