17. The answer is B: He does not harbor hatred for anyone, encouraging his countrymen to do the same. He says to his audience: "We must, therefore, purge ourselves of hatred."
18. The answer is D: Rethorical question. This kind of question doesn't require an answer.
19. The answer is B: The British Imperialism. Gandhi said: "Our quarrel is not with the British people, we fight their imperialism."
20. The answer is A: Pathos. This is used to convince people with an argument that appeals to the audience's emotions.