In which stage of Kohlberg’s moral development does children's reasoning…

Lawrence Kohlberg's theory of moral development describes three levels, each containing two stages. At the Pre-conventional level (Stages 1-2), moral reasoning is governed by consequences -- avoiding punishment and pursuing self-interest. At the Conventional level (Stages 3-4), reasoning shifts to conforming with social expectations, authority, and the law-and-order maintained by society. At the Post-conventional level (Stages 5-6), reasoning is guided by abstract principles of justice that can transcend existing laws.

The question asks which stage centers reasoning on the 'ethics of law' -- this is precisely Stage 4 (the law-and-order orientation) within the Conventional level, where an action is judged right if it upholds social rules, authority, and legal order. So Conventional morality is the stage being described.

The remaining options do not fit this description:

• Pre-conventional morality reasons from punishment-avoidance and self-interest, not from law and social order.

• Heteronomous morality is a term from Jean Piaget's (not Kohlberg's) stage model, describing a child's rule-following out of respect for authority.

• Autonomous morality is also Piaget's term, describing reasoning based on mutual respect and flexible, negotiated rules rather than fixed law.

Because the stem's 'ethics of law' criterion matches Kohlberg's own Conventional level exactly, and the other two distractors belong to an entirely different theorist's framework, Conventional morality is the correct stage.