All the other male pigs on the farm were porkers. The best known among them was a small fat pig named Squealer, with very round cheeks, twinkling eyes, nimble movements, and a shrill voice. He was a brilliant talker, and when he was arguing some difficult point he had a way of skipping from side to side and whisking his tail which was somehow very persuasive. The others said of Squealer that he could turn black into white. –Animal Farm,
George Orwell

How do the key details in the passage develop the central idea that a persuasive speaker can make others believe anything, even lies?

The details show that Squealer is forceful and argumentative.
The details show that Squealer is attractive, which impresses the others.
The details show why other animals might believe anything Squealer says.
The details show that Squealer is a hard worker, which is why the others trust him.