Sam is a participant in a study of moral development. In response to the Heinz moral-dilemma story, Sam says "Heinz shouldn't steal the drug because he will go to jail if he steals. Jail is a bad place so Heinz shouldn't take the risk of such harsh punishment." Sam appears to be operating at which of the following stages of moral development?a. conventionalb. preconventionalc. hyper-conventionald. postconventional