The correct answer is (d), dogfish.
A fish is an aquatic vertebrate animal with gills, fins, and a streamlined body that lives in water. Fish are abundant in both fresh water and salt water. They come in a wide variety of shapes and sizes, from the tiny planktonic fish to the large whale shark.
Starfish are echinoderms, which means they are related to sea urchins and sand dollars. They have a hard outer skeleton and five arms that they use to move around. Starfish are not fish.
Silverfish are insects. They are small, wingless insects that are often found in homes. Silverfish are not fish.
Cuttlefish are cephalopods, which means they are related to squid and octopuses. They have a soft body and eight arms. Cuttlefish are not fish.
Dogfish are sharks. They are small, shark-like fish that are often caught for food. Dogfish are fish.