The answer is B. Aunt Marth has both a kind and cruel personality.
The allusion to Robert Louis Stevenson’s novel Dr. Jekyll and Mr. Hyde in this passage means that Aunt Martha has a personality similar to the "bipolarity" of Dr. Jekyll.
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At the end of Animal Farm, Pilkington and other human farmers come to eat dinner with the pigs at the farmhouse. ... The pigs have started to dress and behave exactly like humans. The book's final image expresses the animals' realization that the pigs have become as cruel and oppressive as human farmers.
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Personification. This is when someone gives human characteristics to something that will normally not have them, like in your case, fog slowly creeping by, which fog can't normally do.