Discussion
An oceanic circulation driven by mechanical stirring, which transports heat, mass, freshwater and other properties in the meridional/zonal direction is called :
Answer: C
It is the thermohaline circulation.
The thermohaline (meridional overturning) circulation is the global ocean circulation linked to differences in temperature and salinity: dense water sinks at high latitudes and spreads through the deep ocean, carrying heat, salt, freshwater and dissolved substances between basins. Studies such as Munk and Wunsch's have shown that it needs mechanical energy from winds and tides, through mixing, to return deep water to the surface, which is the 'mechanical stirring' of the question.
Monsoon, atmospheric and tropospheric circulations are motions of the air, not oceanic circulations.
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