What’s the question abt it?
Without reading what ever story this was from, I would say the logical answer or the answer that would the most sense is D
Answer: change in tone of writing
Explanation: an author may change the tone of their writing. here is an example:
It was so nice to celebrate my birthday with my friends today. If only I could’ve said goodbye to my mom before she passed.
In this example, the tone of the words change between happy/nostalgic to sad/regretful/melancholy etc.
I know it's not a. but I feel it could be b