Recent Research on Lawrence Kohlberg's Stages of Moral Development Has

Recent research on Lawrence Kohlberg's stages of moral development has concluded all of the following EXCEPT:

A) even in adulthood, postconventional reasoning is relatively uncommon.
B) children's different moral judgments are consistent within the stage that they are in.
C) from childhood through adolescence, moral reasoning changes from preconventional to conventional levels.
D) evidence for a gender bias in the stages is mixed.