The correct answer is C.
Mary Shelley's idea for Frankenstein fit the Gothic tradiction because it turned science into horror.
Gothic tradition is largely based on highly developed sense of atmosphere, extreme emotions including fear and awe, and emphases on the mysterious and the paranormal. Shelley includes all of this aspects in her novel by creating a monster and a world of terror with the help of science.
The development of Gothic fiction on Shelley's work can be seen in the cultural concerns about human nature, its potentials and limits, and the forces that go into its making.