What Did Lawrence Kohlberg Place the Most Emphasis on When

What did Lawrence Kohlberg place the most emphasis on when he presented moral dilemmas to individuals in order to evaluate their level of moral development

A)  the level of confidence the individual had in his or her response 
B)  whether the individual gave a "yes" or "no" response 
C)  overt behaviours the individual shows when presented with similar dilemmas in real life 
D)  the explanation the individual gave concerning the reason for his or her response