It would be the third one because you would definitely have to find out why it was written and who the audience was.
Frankenstein is the novel that opens and closes with letters from Robert Walton. Walton writes one-way letters to his sister at the beginning of Mary Shelley's Frankenstein novel.
By using Walton's character and his letters to establish many of the topics later explored in "Frankenstein," such as the desire for knowledge and power, solitude, and nature, Shelley introduces the major themes of the book. These opening letters thus have an effect on the reader since they will shape how they see the rest of the book, leading them to reflect on significant issues that apply to all societies and cultures and giving them a sense of what is to follow in the novel.
The letters Walton writes to his sister from the narrative's framework. Walton even wrote the bulk of the narrative and emailed it to his sister. Walton's sister reads several accounts of the crew members in this letter, particularly the master's. We realize what a romantic Walton is because of the adoring and uplifting way he writes about the master in his story.
The concept of loneliness is introduced in this letter. It demonstrates that not only do all lonely people become insane, but all insane people also become lonely. This alludes to how Victor's madness caused him to lose everyone he had ever loved, but it also shows how the creature, who can't make friends because of the way he looks, becomes mad and begins killing innocent people.
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