An International Human Rights Organization Recommends That Its Member Countries

An international human rights organization recommends that its member countries review their human rights policies on a periodic basis to ensure that their governments are upholding ethical standards for the treatment of prisoners. Which of the following represents the most effective reasoning in support of the organization's recommendation?

A) Ethical policies and practices tend to remain consistent within the same country over time.
B) Nations should only enforce ethical standards that have been approved by other nations.
C) Nations should enforce those ethical standards that have been adopted in other nations.
D) Ethical standards change over time, so national policies should be updated as necessary.