Answer:
C. They can leave the country and fight in Spain.
Step-by-step explanation:
The full title of this Juvenalian satirical essay written anonymously by Jonathan Swift in 1729 is "A Modest Proposal For preventing the Children of Poor People From being a Burthen to Their Parents or Country, and For making them Beneficial to the Publick"
It is a satire on the solutions proposed and steps taken by the authorities to prevent children of poor people of Ireland. Jonathan Swift also satirically gives many proposals to achieve this; one of them even includes killing and eating the children.
According to Swift an advantage of having impoverished children is that, they can leave the country and fight in Spain, as shown by his words in the Proposal,
"as they grow up, either turn thieves for want of work, or leave their dear native country, to fight for the Pretender in Spain, or sell themselves to the Barbadoes."