Why does the temperature of ocean water remain relatively constant, despite large fluctuations in air temperature? ocean water has a high concentration of dissolved salts. ocean water has a high specific heat. ocean water is a major component of organisms. ocean water exists in the form of water vapor.

The answer is:  [B]:  "Ocean water [and water in general] has a high specific heat [capacity]." 
 
    It takes a great deal of energy to break the hydrogen bonds of ocean water (water in general) ;  and there is a great quantity of [ocean water, specifically—over 70% of the surface of the Earth—not to mention the depth].