The term epifauna and infauna are related with:

Correct option is C

Correct Answer: (c) Benthos
Explanation:
→ Epifauna live on the surface of the seabed (e.g., crabs, sea stars); infauna live within the sediments (e.g., polychaetes, bivalves).
→ Both categories describe components of the benthic community.
Information Booster:
→ Benthos plays a key role in nutrient cycling, sediment bioturbation and as food for higher trophic levels.
Additional Information (Other Options):
(a) Neuston: organisms at the air–sea interface.
(b) Nekton: actively swimming organisms.
(d) Profundal fauna: deep-lake deepwater organisms (freshwater context).