Read the passage from Animal Farm.

Since Jones had left the farm, until today, no animal had killed another animal. Not even a rat had been killed. They had made their way on to the little knoll where the half-finished windmill stood, and with one accord they all lay down as though huddling together for warmth—Clover, Muriel, Benjamin, the cows, the sheep, and a whole flock of geese and hens—everyone, indeed, except the cat, who had suddenly disappeared just before Napoleon ordered the animals to assemble. For some time nobody spoke. Only Boxer remained on his feet. He fidgeted to and fro, swishing his long black tail against his sides and occasionally uttering a little whinny of surprise. Finally he said:

"I do not understand it. I would not have believed that such things could happen on our farm. It must be due to some fault in ourselves. The solution, as I see it, is to work harder. From now onwards I shall get up a full hour earlier in the mornings."

And he moved off at his lumbering trot and made for the quarry. Having got there, he collected two successive loads of stone and dragged them down to the windmill before retiring for the night.

Which detail from the passage supports the idea that Orwell wrote this novel to demonstrate the horrors of totalitarianism?

“It must be due to some fault in ourselves.”
“Only Boxer remained on his feet. He fidgeted to and fro.”
“Until today, no animal had killed another animal.”
“With one accord they all lay down as though huddling together for warmth.”