A body just floats in seawater but sinks in river water because:

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Sea water has greater density than river water.

River water is more contaminated than seawater.

Sea water has lesser density than river water.

Sea water exerts less upthrust on the body than river water.

answer is B.

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Detailed Solution

Seawater is denser than river water due to the addition of salt.
As a result, the upthrust exerted by sea water is more than the river water which makes a body float on sea water.

Hence, a body simply floats in the seawater while it sinks into the river.

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