Which one of the following is a filter feeder?

1. A filter feeder is an animal that feeds by straining suspended matter and food particles from water, typically by passing the water over a specialized filtering structure. 2. Catfish (A) are diverse; many are bottom feeders, scavengers, or predators, not primarily filter feeders. 3. Octopus (B) is a cephalopod mollusc and an active predator, using its tentacles to capture prey. 4. Oyster (C) is a bivalve mollusc that feeds by drawing water into its shell and over its gills, which trap plankton and other small food particles. This is the definition of filter feeding. 5. Pelican (D) is a bird that primarily eats fish, catching them by diving and scooping them up with its large throat pouch. It is not a filter feeder. Therefore, the Oyster is the filter feeder among the options.