I think D best supports the theme of the text.
Answer: Write a essay about the quality of being honest and having strong moral principles; moral uprightness.
"he is known to be a man of integrity"
synonyms:
honesty · uprightness · probity · rectitude · honor · honorableness
Explanation:
I wrote a short story that took up an entire summer day...
Still I'm not sure that is the answer you are looking for so please explain better if I'm not answering correctly.
(/◕ヮ◕)/
-Miri