Which of the Following Statements Best Describes Kohlberg's Work

Which of the following statements best describes Kohlberg's work?

A) He tried to find out whether children were sensitive enough to see a moral problem.
B) He assessed the empathy related to moral situations of the participants in his study.
C) He thought cognition and affect are two different perspectives on the same mental events.
D) His theory served as a means for participants to author and engage in social interactions with others.