Answer:
C. Puedes cambiar la persona que resuelve el conflicto y cómo lo hace.
Step-by-step explanation:
I think C is the right choice because A and D implies changing the time of the legend for a future one, making it a sci-fi story (or something like that) rather than a legend.
B implies you simply changing the names and places and there nothing original about that, while C doesnt mess up with time and makes you write a different ending (original).
Hope this helps