What do all Commonwealth nations have to agree to?

All Commonwealth nations, as part of their membership, are expected to agree to the values set out in the Commonwealth Charter. This Charter outlines key principles that underscore the organization's mission, including democracy, human rights, peace, and the rule of law. By committing to these shared values, member countries work towards fostering cooperation and collaboration across diverse cultures and political systems.

In contrast, the other options do not reflect a unified requirement for Commonwealth nations. While countries within the Commonwealth can establish their economic policies independently, they are not bound to agree on a specific set of policies. Military alliances are not a requirement for Commonwealth membership; nations have sovereignty over their defense decisions. Additionally, cultural traditions are specific to each country and cannot be standardized across all member states, as the Commonwealth values cultural diversity and respect for individual nations’ heritages.