Answer:
Chillingworth wants revenge against Hester's lover.
Step-by-step explanation:
Nathaniel Hawthorne's novel "The Scarlet Letter" revolves around the 'infidelity' and 'adultery' of Hester Prynne. And since this was a big moral as well as spiritual sin in the Puritan society where the story is set, Hester Prynne was convicted and tortured, humiliated, and made to wear a 'scarlet letter' on her chest.
Roger Chillingworth is the real husband of Hester but had arrived later than his wife. Once he discovered that his wife has had a child with an unknown man, he was adamant about finding out the secret lover. He disguises himself and went to the market place to view Hester and her daughter, Pearl, being paraded in the marketplace. He uses his knowledge and tries to find out the 'secret lover' of Hester.
Thus, the correct answer is the fourth or last option.