The central idea of the passage is:
D. The pigs are socializing with humans and behaving like them.
From the excerpt, we discover that the writer reveals that "The pigs appeared completely at ease in their chairs" when "Napoleon himself occupying the seat of honour at the head of the table" . This depicts that the pigs were socializing with humans.
- Napoleon is seen sitting on the same table with the pigs.
- Napoleon, a human and the pigs doing the same thing reveals that the pigs were doing same thing as the humans.
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