It keeps them on edge, and makes them cave into whatever you are persuading them to do/say/buy etc.
Answer:
A.alteration is the answer of this question
At every point of Swift proposal the reader from today gets the idea he is being ironic.This way he is critisizing the attitudes an ideas of the time.In order to improve a financial situation people would sell their souls.Contemporaries could not understand and tought of it as a sacrifice, today it is something different, the idea is satirizised
