Answer:
Dramatic Irony
Explanation:
Dramatic irony is demonstrated as the literary devices in which the audiences' are aware of a specific situation, cause of conflict, or its resolution but the characters are not. It helps the author in developing tension among the readers and building suspense as the readers' are uncertain about the characters' next move. Similarly, in the given example audience knowing about the 'masked young man being Romeo, a Montague' and characters not having an idea of this exemplifies 'dramatic irony.'
The type of figurative language that is used in the sentence from George Orwell's novel Keep the Aspidistra Flying is a metaphor. A metaphor is a figure of speech that compares two different things in an implied way. In this line, the public is compared to a swine and advertising is compared to the rattling of a stick inside a swill-bucket.
Whenever anything went wrong, they always blamed Stanley's no-good-dirty-rotten-pig-stealing-great-great-grandfather.
Your answer is the fourth option, provender