Read this excerpt from We’ve Got a Job: The 1963 Children’s March.

Lucinda Robey, a friend of Arnetta's mother, recruited interested youngsters to participate in the Movement. She picked Arnetta up and drove her to the training, which was held in the basement of Sixteenth Street Baptist Church. Arnetta discovered that the sessions were as tough as boot camp, and the teachers were as tough as the nuns at St. Mary's.

Which part of the narrative structure does the author develop in this excerpt?

Plot is developed as Arnetta becomes involved in social activism.
Characterization is developed to reveal Arnetta’s physical condition.
Conflict is developed as Arnetta is disciplined harshly at boot camp.
Setting is developed in the description of the church basement.