B. Mutability of History.
In Chapter 4 of George Orwell's "1984," Winston's job involves altering historical records and newspaper articles to fit the current propaganda of the ruling party. This highlights the theme of the mutability of history, or the idea that the past can be changed to suit the present narrative. The ruling party in the novel uses this tactic to control the population and maintain their power. The mutability of history also ties into the theme of truth and the suppression of dissenting voices.