As Delia and Her Mother Are Out Shopping, They Watch

As Delia and her mother are out shopping, they watch as another shopper accidentally drops her basket of groceries all over the floor. Delia's mother tells her to wait while she assists the lady, and proceeds to help pick up all of the dropped groceries. At school the next day, Delia assists a classmate who dropped her books on the way into class in the same manner. In this case, Delia's mother has helped inspire prosocial behavior by

A) ​induction of prosocial acts.
B) ​providing Delia an opportunity to behave prosocially.
C) ​disciplinary practices that reward prosocial behavior
D) ​modeling prosocial behavior.