The correct answer is A. Plankton.
Plankton are organisms that float or drift in the water column and cannot swim against a current. They are a diverse group of organisms, including algae, bacteria, protozoa, and small animals. Plankton are an important part of the marine food web, and they play a role in the cycling of nutrients.
Benthos are organisms that live on or near the bottom of the ocean. They include a variety of animals, such as sponges, corals, and sea anemones, as well as plants, such as algae and seaweed. Benthos are an important part of the marine ecosystem, and they provide food and shelter for other marine organisms.
Neritic organisms live in the neritic zone, which is the area of the ocean that extends from the shore to the continental shelf. The neritic zone is relatively shallow, and it is well-lit by sunlight. Neritic organisms include a variety of fish, shellfish, and algae.
Pelagic organisms live in the pelagic zone, which is the open ocean. The pelagic zone is much deeper than the neritic zone, and it is not as well-lit by sunlight. Pelagic organisms include a variety of fish, squid, and jellyfish.