Answer:
Mary Shelly made use of a technique known as EMBEDDED NARRATIVE
Step-by-step explanation:
When using embedded narrative, it means that the main story is told within a framing narrative. The structure of Frankenstein is more complex when compared to other novels. Mary shelly starts by using a framing narrative in frankenstein( Walton's letters to his sister), then continued to the main narrative which is ( victor's story). Still within that is the monsters story of survival and how He learns from the family of Delacy.
By the use of such complex narrative, Shelley is able to guide the readers towards the central ideas of the novel which might have been dismissed as beyond relief if she had introduced suddenly.
Futhermore, In other to highlight the themes of the novel from different viewpoints Mary Shelly made use of the three varied narrative technique.