Answer: You're supposed to answer this by yourself
Explanation:
The Question is about your greatest regret not nobody else
C because it sounds more formal and like you know what you are talking about !
The writer's world is another way of saying; "The scene that is being set for the story to be told. Time, Location, Characters, Mood, Situation, etc.
For example, If you were telling a story about Dungeons and Dragons, perhaps you would mention that the main characters, Corlon, a Fighter and Esmerelda, a Sorceress are Trapped in a Dragon's Cave guarded by a Large one-eyed Cyclops and a Very Large Hungry Green Dragon. And so on.
The voice is how a person expresses their idea in words. In this case, the voice was first written with an informal voice, while they are asked to change to formal.
