Hello,
The answer is option C "falling action".
Reason:
The answer is option D because it falls right after the climax which is the middle it should go in this early: Conflict, exposition, climax, falling action, and resolution. Its not option A because exposition is the first stage. Its not option B because thats the second stage. Its also not option D because thats the last stage.
If you need anymore help feel free to ask me!
Hope this helps!