The book follows a group of farm animals who rebel against their human farmer in the hopes of establishing a society in which all animals are equal, free and joyful.
Correct option is B.
Orwell used humor by having the pigs walk on two legs, which alludes to how the pigs had evolved into everything they had spoken against. They had seized the farm from the cruel humans and gradually absorbed all of their vices, becoming even more despotic rulers than the farmer who had previously looked after the animals.
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