Sea breeze is formed during daytime. During the day, the land heats up more quickly than the sea. This causes the air above the land to become warmer and less dense compared to the air above the sea. As a result, the warm air over the land rises, creating a low-pressure area. The cooler, denser air over the sea then flows towards the land to fill in the gap, resulting in the sea breeze.

Option 1, "Daytime," is the correct answer as it accurately describes the time period when sea breezes occur. Sea breezes are less likely to form during nighttime when the land cools down, leading to a reversal of the wind pattern. Option 2, "Nighttime," is incorrect. Option 3, "Both," is not accurate because sea breezes primarily occur during the day. Option 4, "Seasonal," is also incorrect as it does not specify a specific time period within a season.