What technique does Mary Shelley use to develop the themes of Frankenstein?

AShe writes from the points of view of different characters.
BShe uses time travel to shift back and forth between settings.
CShe develops the plot through a series of diary entries.
DShe uses a frame to develop a story within a story.

Verified Answer :

The correct answer for the question that is being presented above is this one: "b. She uses time travel to shift back and forth between settings." The technique does Mary Shelley use to develop the themes of Frankenstein is that she uses time travel to shift back and forth between settings.