Which phenomenon replaces warm rising air during a sea breeze?

The phenomenon that replaces warm rising air during a sea breeze is indeed cool air from the sea. During the day, the land heats up more quickly than the water in the ocean. This causes the air above the land to warm, rise, and create an area of lower pressure. As this warm air rises, it is replaced by cooler, denser air that moves in from the ocean, where the temperature is more stable and cooler than the air above the heated land. This movement of cool air from the sea towards the land forms the sea breeze, effectively creating a cycle of air movement that helps moderate temperatures along coastal areas.

The other options do not accurately represent the process occurring during a sea breeze. For instance, warm air from the land does not replace the rising air; instead, it is the result of heating the land. The notion of stable air from above is less relevant in the context of a sea breeze, as this phenomenon is driven primarily by temperature differentials at the surface level. Lastly, warm air from over the ocean would not replace the rising air but rather contribute to a larger system of air movement that would not facilitate the cooling effect of the sea breeze.