Which of the Following Young Adults Exemplifies Kohlberg's Postconventional Level

Which of the following young adults exemplifies Kohlberg's postconventional level of moral reasoning?

A) 28-year-old person who calls in sick so as to help a friend move to a new location
B) 22-year-old man who uses marijuana on the weekends with friends
C) 30-year-old woman who volunteers at a soup kitchen one day a month
D) 35-year-old who works long hours so as to be considered for a promotion