Answer:
B). Dramatic irony occurs because the reader knows that Napoleon won't die-he drank too much alcohol.
Step-by-step explanation:
Irony is demonstrated as the literary device in which there is an incongruity between the expectations or the intended meaning and the reality or actual meaning of a situation.
Dramatic irony is characterized as the form of irony in which the readers or the audience possess a clear understanding of the situation(in a drama) while the characters remain unaware. Thus, there lies a contradiction in the plot.
In the given passage, Orwell employs 'dramatic irony' as there is an incongruity between the readers' and characters' understanding. The readers are aware that Napoleon won't die(as he had drank alcohol excessively, nothing else) but the characters think that 'he had a terrible piece of news to impart.' Therefore, option B is the correct answer.