Answer:
D. His mission to discover the truth of what happened.
Step-by-step explanation:
Roger Chillingworth is Hester's husband, who arrives to Salem only to discover that Hester has had a baby with another man. Roger Chillingworth becomes obsessed with discovering who the father is, and what really happened between him and his wife. This obsession with discovering the truth changes Chillingworth from a sweet man to a bitter old man.