Sea breeze is most effective at

Analyze the question: The question asks when a sea breeze is most effective. A sea breeze is a wind that blows from the sea toward the land.

Explain the concept: Land and water heat up at different rates.

• Land heats up quickly in sunlight.
• Water heats up slowly because of its high specific heat capacity.

Step-by-step solution:

1. During the day, the sun heats the land faster than the sea.
2. The air over the land becomes warm, expands, and rises. This creates a low-pressure area over the land.
3. The air over the sea stays cooler and denser, so it has higher pressure.
4. Air moves from high pressure to low pressure, so cool air flows from the sea to the land. This is the sea breeze.
5. It is strongest in the early-to-mid afternoon, when the temperature difference between land and sea is greatest.

At night, the process reverses. The land cools faster than the sea, so the wind blows from land to sea. This is a land breeze, so option D is wrong.

Seasons (winter or summer) do not decide when a sea breeze occurs. They can affect its strength, but the key factor in this question is the daily heating cycle. Summer can strengthen the effect, but the question is asking for the general time of effectiveness, and "day time" is the most direct and complete answer.

Answer: B. day time

Exam tip: Remember "Sea breeze = Sunny day", since both start with S. Land breeze happens at night, when the land cools quickly. Always match the breeze to the time of day.