Which article of the Charter addresses non-discrimination?

The choice highlighting Article 21 is indeed correct because it explicitly focuses on the principle of non-discrimination. Article 21 of the Charter outlines that everyone should have access to equal protection under the law and should not face discrimination based on race, gender, ethnicity, or other personal characteristics. This is a fundamental aspect of human rights legislation aimed at fostering equality and safeguarding individuals against unfair treatment.

In contrast, the other articles mentioned do not concentrate specifically on non-discrimination. For instance, Article 15 deals with the right to work, Article 24 pertains to the right to rest and leisure, and Article 30 addresses the right to the social, cultural, and environmental aspects of life. While these articles may touch upon rights and freedoms, they do not encapsulate the overarching theme of non-discrimination in the same way that Article 21 does. This makes Article 21 a pivotal reference in discussions around equality and individual rights in the context of non-discrimination.