Orwell uses Squealer's explanation to support the purpose of illustrating the manipulative tactics employed by totalitarian leaders. The most fitting choice is:
Squealer's explanation of Napoleon's tactics is representative of a dictator who reverses policies and lies about his reasons.
This option highlights how Squealer, as a mouthpiece for Napoleon, distorts the truth and revises history to maintain control and influence over the other animals. By claiming that Napoleon was always in favor of the windmill, despite his previous opposition, and framing his actions as tactics to eliminate Snowball, Squealer exemplifies the disturbing nature of propaganda used in dictatorial regimes. This reinforces the theme of manipulation and the rewriting of facts to consolidate power, akin to the practices of real-world dictators.