Shelley states that, "invention . . . does not consist in creating out of void, but out of chaos." What chaos most likely enabled her to invent the characters of her ghost story?

A. A combination of Lord Byron's poetry and her husband's insistence on writing
B. A combination of depression, personal loss, and a desire for fame
C. A combination of Polidori's story and delirium caused by an illness
D. A combination of a vividly terrifying nightmare and a discussion of Darwin