Option 1 states that both the assertion (A) and the reason (R) are true, and that the reason is the correct explanation of the assertion.

The assertion states that in coastal regions, during the night, the land breeze blows over to the sea. This means that the wind blows from the land towards the sea.

The reason states that in coastal regions, during the night, the air over the sea is warmer than the air over the land. This means that the temperature of the air over the sea is higher than the temperature of the air over the land.

Both the assertion and the reason are true. This is because at night, the land tends to cool down faster than the sea. As a result, the air over the land becomes cooler than the air over the sea. The difference in temperature creates a pressure gradient, causing the wind to blow from the land towards the sea.

Furthermore, the reason correctly explains why the land breeze blows over to the sea during the night in coastal regions. The warmer air over the sea creates a lower pressure compared to the cooler air over the land, causing the wind to flow in that direction.

Therefore, option 1 is the correct answer.