The answer is D: They both contain stories with a moral.
Fables are stories that involve animals, plants, or even inanimate objects as their characters set in a plot whose resolution conveys a moral.
Parables are short stories —with human characters— that represent an ethical principle set in a plot whose resolution, also, convey a moral. Parables are usually associated with the Parables of Jesus in the Gospels, but the term is not restricted to the teachings of Jesus.
A few descriptions about Zaroff's physical features serve to warn Rainsford and me are his high cheekbones, a very pointy nose, his black like eyes, and his two very pointed teeth.