Answer:
Open system
Step-by-step explanation:
There are three types of systems in thermodynamics: open system, closed system and isolated system. An open system allows the exchange of energy and matter with surroundings, a closed system only allows the exchange of energy and no matter, and isolated systems do not exchange either energy and matter.
The ocean is an open system because the water vapor (matter or mass) enters the atmosphere through the process of evaporation and transfers heat energy (called latent heat) in the atmosphere.
Hence, the correct answer is "Open system".