The correct answer is A. Cat fish.
A bottom feeder is an aquatic animal that feeds on or near the bottom of a body of water. They are often scavengers, eating dead and decaying organisms. Some bottom feeders, such as catfish, have specialized adaptations that help them to feed on the bottom, such as barbels around their mouths that help them to sense food.
B. Frogs are not bottom feeders. They are carnivores that eat insects, spiders, worms, and other small animals. They use their long tongues to catch their prey.
C. Snakes are also not bottom feeders. They are carnivores that eat a variety of animals, including rodents, birds, reptiles, and amphibians. They use their sharp teeth to catch and kill their prey.
D. Tadpoles are the larval stage of frogs. They are not bottom feeders. They are herbivores that eat algae and other aquatic plants. They use their mouths to suck up food.