Which of the following is a specific aspect of post-conventional morality?

Post-conventional morality is characterized by an individual's ability to go beyond societal norms and rules and to make moral decisions based on abstract reasoning and ethical principles. This stage, as described by Lawrence Kohlberg in his theory of moral development, represents a higher level of moral reasoning where individuals consider broader principles that transcend specific laws or social conventions.

Affirming agreed-upon rights reflects a commitment to fundamental human rights and social agreements, emphasizing ethical standards that may not be enshrined in law but are upheld by a community as part of their moral understanding. This involves recognizing the value of individual rights and the importance of mutual respect in society, thus demonstrating a complex understanding of morality that goes beyond mere adherence to laws or seeking social approval.

The other options, such as self-interest, laws and rules, and social approval, represent earlier levels of moral reasoning. These relate to a more concrete understanding of morality based on external factors rather than the intrinsic ethical principles found at the post-conventional level. Therefore, affirming agreed-upon rights is distinct and aligns closely with the principles of post-conventional morality.