Which of the following is one of the basic rules proposed by Kant for a well-ordered society?

Kant's philosophical framework centers around the importance of treating individuals as ends in themselves rather than as mere means to achieve certain goals. This perspective is rooted in his deontological ethics, which emphasizes the inherent dignity and worth of each individual. By proposing the rule that one cannot use people simply as tools for personal gain, Kant advocates for a moral framework that respects the autonomy and rationality of each person. This principle is foundational in promoting mutual respect and ethical interactions within a society, leading to a social order based on duty, respect, and moral responsibility.

The other options reflect different ethical theories that do not align with Kantian principles. Maximizing pleasure is indicative of utilitarianism, which contrasts with Kant's focus on duty and moral law. The idea of self-interest being paramount aligns more closely with egoism, which deviates from the duty-based ethical framework Kant espouses. Consequentialist views prioritize the outcomes of actions, while Kant emphasizes the intention and adherence to moral laws regardless of consequences. Thus, the proposed rule that one cannot use people as a means to an end captures the essence of Kantian ethics as foundational for a well-ordered society.