Sessile creeping and burrowing organisms found in the bottom of water body:

Correct option is C

Correct Answer: (c) Benthos
Explanation:
→ Benthos includes all organisms living on or in the bottom substrates — sessile, creeping or burrowing (e.g., polychaetes, bivalves, echinoderms).
→ They are central to benthic food webs and sediment processes.
Information Booster:
→ Benthos are sampled by grabs, cores and epibenthic sleds for ecological assessments.
Additional Information (Other Options):
(a) Nekton: swimmers; (b) Seston: suspended particulate matter; (d) Neuston: surface-film dwellers.