When Donatus Spontaneously Decides to Help His Mother Carry Bags

Multiple Choice

When Donatus spontaneously decides to help his mother carry bags into the house (after having seen his brother do this task several times before) , his mother says, "Thank you Donatus. You are such a helpful person!" What has Donatus's mother used to make it more likely that Donatus will act altruistically again?

A) empathy
B) perspective-taking
C) prosocial behaviour
D) praise