-Which of the Following Is the Best Explanation for the Relationship

Multiple Choice

-Which of the following is the best explanation for the relationship between salinity and depth in the mixed layer?

A) Salt is only slightly soluble in cold water,so salinity always decreases with water temperature.
B) Warm water is evaporating at the surface,so the water becomes saltier at the surface.
C) The increase in density and pressure with depth causes salt to precipitate out of the water,so the water becomes less salty with depth in the mixed layer.
D) Salt water is less dense than fresh water,so water with the highest salt content would rise to the surface.