At which stage of Lawrence Kohlberg's theory of moral development do…

Kohlberg's theory of moral development describes moral reasoning as developing through three levels — Preconventional, Conventional, and Postconventional — each made up of two stages. Reasoning moves from avoiding punishment and serving self-interest (Preconventional), to upholding internalized social rules and duties (Conventional), to finally following self-chosen, abstract ethical principles (Postconventional).

The stem describes a belief that actively maintaining the current social system safeguards positive human relationships and societal order. This is the Conventional level's Stage 4, the social-order-maintaining orientation (sometimes called the "law and order" orientation): right conduct means doing one's duty, respecting authority, and keeping the social system running for its own sake — a step beyond Stage 3, which is about winning interpersonal approval rather than preserving the system itself.

Checking the other named stages against the stem confirms none of them fits:

• The punishment and obedience orientation (Stage 1, Preconventional) judges an action only by whether it avoids punishment from an authority — it makes no reference to preserving the social system.

• The instrumental purpose orientation (Stage 2, Preconventional) judges an action by whether it serves one's own interest through a fair exchange or reciprocal deal, not by whether it upholds social order.

• The universal ethical principle orientation (Stage 6, Postconventional) bases conduct on self-chosen, abstract principles of justice, applied consistently even when they conflict with the existing laws or system — the opposite of upholding the current system for its own sake.

So the belief described in the stem matches Stage 4: the social-order-maintaining orientation.