Kohlberg's cognitive developmental theory of moral development claims that

a. regression from a higher to a lower stage of moral reasoning is quite common.
b. through an exploration of moral dilemmas, it is possible to teach someone to skip over the lower stages of moral development.
c. the sequence of stages one goes through may vary from one culture to another.
d. a person's stage of moral development is determined by the person's thoughts, rather than his or her actions.

d