Kohlberg emphasized perspective taking and as critical aspects of the social stimulation that challenges children to change their moral reasoning.

The answer to this question is peer interaction.

Lawrence Kohlberg is a psychologist who developed the judgment about social stimulation. Peer interaction is the way of interacting of children and adolescents. In peer interaction, children and adolescents learn vocabulary, languages, and other traits from their peers. 

this would and i think the answer is d