Percy Bysshe Shelley wrote the preface to Mary Shelley's Frankenstein 1........ September 1817. It immediately alludes to a "Dr. (Erasmus) Darwin," which gives some medical and scientific credence to the novel that it might not have had. Percy Shelley also mentions the German philosophical writers who, 2........ the time, were experimenting 3 ............ novels that touched on the Gothic genre, the science fiction genre, and the medical genre. (https://www.cliffsnotes.com/literature/f/frankenstein/summary-and-analysis/preface-to-the-1817-edition) Which is the correct alternative to complete the text: