I think it is D - supporting detail, just a guess tho
Answer:
Dear father,
hope you are doing well father. I am doing good over here and settled comfortably in the hotel. I wrote this letter to request you to buy a computer for me.
As you are aware of the current education advancements. We get a lot of projects that are needed to be made on a computer with the help of power-point presentation. Our school has taken a step to prevent wastage of paper. Therefore, I would request you to buy me a computer so that I can start with my project as soon as possible.
Give love and regards to mother and sister.
Explanation:
She said that she can write a story.
