The picture shows the vertical stratification of the atmosphere. Look at the picture and answer questions 22-24: 22. The curve that correctly represents the vertical change of atmospheric temperature

The picture shows the vertical stratification of the atmosphere. Look at the picture and answer questions 22-24: 22. The curve that correctly represents the vertical change of atmospheric temperature in the figure is () 23. The atmosphere is divided into three layers from top to bottom, namely troposphere, stratosphere and upper atmosphere. The troposphere contains three-quarters of the atmospheric mass, as well as almost all water vapor and impurities. The temperature decreases with the elevation, the air convection is obvious, and the weather phenomenon is complex and changeable, which is most closely related to human beings. In the picture, I is the troposphere, II is the stratosphere and III is the upper atmosphere, so I is correct.

So choose: a.