Geographical weather observation

A, according to the figure, the atmospheric temperature at 5 o'clock and 20 o'clock increases with the increase of height, that is, it is cold and hot, and the atmosphere is stable, so it is correct;

B, according to the figure, the temperature at 12 and 15 decreases with the increase of height, so there is no temperature inversion;

C, the direct heat source of near-surface atmospheric temperature is ground radiation, not solar radiation, so it does not meet the meaning of the question;

D, according to the picture, the lower the temperature, the greater the change, which does not meet the meaning of the question.

So choose: a.