Which details make the proposal sound practical? what effect on readers does swift intend the sensible approach of his narrator to have?

  The correct answer is :  The proposal seems practical because hundreds of thousands of people who cannot work will find food and because begging will end because beggars can find work as farmers. With the narrator's proposals, exports would increase and the economy would improve, the poor would also have a source of income, the population of Catholics would decrease, men would not beat their wives.

The narrator uses the exaggeration to help understand the problem of poverty of the nation, in some paragraphs the reader may be surprised at the ridiculous exposures. Swift believes that these solutions have not worked because the Irish are too lazy.

There are, however, many advantages for the inhabitant of this strip. He does not require to ... brings some dainties with him, or privately pays the steward for extra rations, ... devoted to each other, with a pleasant story of how they had first seen each ... The children found each other out like dogs, and ran about the decks.