Discussion
In the deep ocean the circulation is caused by density variations due to difference in :
Answer: B
Deep circulation is driven by density differences due to temperature and salinity.
This is the thermohaline circulation. Seawater becomes denser when it is cooled and when its salinity rises, for example as sea ice forms and rejects salt. In the North Atlantic and around Antarctica, cold, salty surface water sinks and spreads through the deep basins, slowly driving the global overturning circulation.
Water depth is not a property of the water that can make it sink, and the difference between sea surface and air temperature drives heat exchange and winds rather than deep circulation directly. Only the pair temperature and salinity sets seawater density.
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