The water content in the forest is high, and the water evaporates and absorbs heat under the sunlight, which makes the temperature in the forest rise slowly, the temperature is relatively low and the density is relatively high.

The air outside the forest has high temperature and low density. After the hot air rises, the cold air in the forest supplements to form the wind.

The wind blows from the forest to the outside world. If you want to get out of the forest, you must go with the wind.

So choose a.