The statement that best describes how propaganda reinforces one of the themes of Animal Farm in this passage is:
It demonstrates that corruption is at the center of totalitarian governments.
In this passage, the pigs rationalize their behavior of sleeping in beds, which contradicts the original commandments of Animalism. Their manipulation of language and reinterpretation of rules to suit their needs highlights the corruption of the leadership and the ways in which those in power manipulate truth to maintain control, a central theme of the novel.