Question

satire in swifts \a modest proposal\
disobliging england. for this kind of commodity will not bear exportation, and flesh being of too tender a consistence, to admit a long continuance in salt, although perhaps i could name a country, which would be glad to eat up our whole nation without it.
after all, i am not so violently bent upon my own opinion, as to reject any offer, proposed by wise men, which shall be found equally innocent, cheap, easy, and effectual. but before something of that kind shall be advanced in contradiction to my scheme, and offering a better, i desire the author or authors will be pleased maturely to consider two points. first, as things now stand, how they will be able to find food and raiment for a hundred thousand useless mouths and backs. and secondly, there being a round million of creatures in humane figure throughout this kingdom, whose whole subsistence put into a common stock, would leave them in debt two million of pounds sterling, adding those who are beggars by profession, to the bulk of farmers, cottagers and labourers, with their wives and children, who are beggars in effect; i desire those politicians who dislike my overture, and may perhaps be so bold to attempt an answer, that they will first ask the parents of these mortals, whether they would not at this day think it a great happiness to have been sold for food at a year old, in the manner i prescribe, and thereby have avoided such a perpetual scene of misfortunes, as they have since gone through, by the oppression of landlords, the impossibility of paying rent without money or trade, the want of common sustenance, with neither house nor cloaths to cover them from the inclemencies of the weather, and the most inevitable prospect of intailing the like, or greater miseries, upon their breed for ever.
i profess, in the sincerity of my heart, that i have not the least personal interest in endeavouring to promote this necessary work, having no other motive than the publick good of my country, by advancing our trade, providing for infants, relieving the poor, and giving some pleasure to the rich. i have no children, by which i can propose to get a single penny; the youngest being nine years old, and my wife past child - bearing.
in the last paragraph, how does swift try to convince his readers to trust him?
he provides evidence that his proposal will work.
he insists that he cannot benefit personally from his proposal.
he assures his readers that his proposal is just a joke.
he claims that his proposal will not be difficult to implement.

Explanation:

In the last paragraph, Swift states he has no children to gain from the proposal (youngest is nine, wife past child - bearing) and his motive is only the public good. This shows he insists he can't personally benefit from the proposal, which is a way to build trust. Option A is about proving the proposal works (not trust - building here), Option C says the proposal is a joke (contradicts Swift's satirical but serious - seeming presentation), Option D is about implementation ease (not trust - building).

Answer:

B. He insists that he cannot benefit personally from his proposal.