The correct answer is option C, Nektons
Nektons are organisms which are able to swim irrespective of the current direction. They spend most of their time in the water strata. Some common examples are - Whales, most of the fish , etc.
While planktons live in water strata, they are unable to swim along with and against the current. While netric zone organism such as star fish , Sea urchin , crabs etc, They are drifted by the ocean currents. And benthos are organisms that live in or near sea bed . They remain attached or move freely but are unable to swim.
