Which Aspect of Kohlberg's Theory of Moral Development Has Received

Which aspect of Kohlberg's theory of moral development has received the most consistent support?

A) Moral reasoning advances in all people, from interpersonal concerns to a concern with individual rights.
B) Most adults reach the highest level of moral reasoning.
C) Children are not capable of any moral understanding until middle childhood.
D) Most people develop through the stages in the same sequence and do not regress to lower stages.