Which type of figurative language is used in this sentence from george orwell’s novel keep the aspidistra flying?

the public are swine; advertising is the rattling of a stick inside a swill-bucket.

(a) flashback

(b) oxymoron

(c) euphemism

(d) metaphor

a

explanation:

evertheless he ought to be slow to believe and to act, nor should he himself show fear, but proceed in a temperate manner with prudence and humanity, so that too much confidence may not make him incautious and too much distrust render him intolerable.

explanation: