Answer: C. He suggests an extreme solution to draw attention to a real problem.
Explanation:
Swift uses satire to shock his audience and to point at a real problem there. He points at the hypocrisy of landlords, who, "have already devoured most of the parents and seem to have the best title to the children".
He proposes food to feed the landlords and to convey that them "devouring most of the parents" and getting ready to "devour" the children as well is not alright, it's against moral standards.
He offers himself to give them food and forces them to look at their own deeds.