Which description defines thermohaline circulation and its climate role?

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Thermohaline circulation is the global ocean flow that is controlled by density differences created by temperature and salinity. This density-driven system involves the sinking of dense, cold, salty water in certain regions and the slow movement of this water as deep currents that connect with the rest of the ocean. Because these deep and upper layers are linked around the world, the circulation acts as a conveyor belt that redistributes heat from the tropics toward higher latitudes, shaping regional climates.

This description fits best because it emphasizes both the density-driven (thermo- and haline) mechanism and the global heat redistribution that affects climate. It’s not just surface winds driving currents, nor merely tides mixing near coasts without deep movement, nor a system with no deep mixing. Those aspects describe different, more localized processes.