Two things that Characterize the practice of science is empirical evidence and community consensus. Hope this helps.
Answer:
Your question is unclear but, based on the context, it is clear to me that the point that comes after C (point D) refers to the process of evaporation. Please try to post a picture of the diagram and make your question clearer next time.
Explanation:
The answer is the stratosphere and the the thermosphere ( b)
