According to Research on Kohlberg's Stages and Associated Levels of Cognitive

According to research on Kohlberg's stages and associated levels of cognitive development, which of the following is impossible?

A) a formal-operational individual who reasons at Kohlberg's postconventional level
B) a formal-operational individual who reasons at Kohlberg's preconventional level
C) an individual with very poor role-taking skills who reasons at Kohlberg's conventional level
D) an individual with well-developed role-taking skills who reasons at the preconventional level