I would say it's D because it's explaining how the sun's heat and warmth is being trapped
Start with the main topic and then break into sub categories
Ex:
Subject : cat meme
Sub: how did cat meme start
Sub: what are cat meme
Sub: how to make your own cat meme
Conclusion and thesis
Answer: The answer would be wistfully
Explanation: The definition of wistfully is longing. If the steak is forbidden, and he is hungry then he wants very badly to eat it.
