The weather is hectopascals.

There is a cold air mass in the south of the southern hemisphere and a warm air mass in the north. According to the horizontal movement direction of the cyclone in the southern hemisphere converging clockwise to the center, it is judged that the airflow from north to south is a warm front.

Before the warm front crosses the border, the temperature is low, the air pressure is high, the weather is sunny, and there is often continuous rainfall during the border crossing. After crossing the border, the temperature rose, the air pressure dropped and the weather turned fine. Therefore, during the warm front transit, the temperature rises.

So choose: a