Who has the right of access to EU documents according to the Treaty?

The correct choice highlights that citizens of the European Union and residents of Member States have the right of access to EU documents as stipulated by the Treaty. This principle is grounded in the commitment to transparency and accountability within the EU framework. By allowing access to documents, the EU aims to enhance public involvement in decision-making processes and promote democracy.

This transparency initiative not only helps citizens stay informed but also encourages civic engagement by granting them the ability to participate and hold institutions accountable. It reflects a broader commitment to ensuring that governance is open and accessible to those it affects most directly—namely, the individuals within its jurisdiction.

The other options suggest restrictions or limitations that do not align with the established principles of the EU's access rights. For instance, limiting access solely to EU officials would contradict the purpose of fostering transparency. Similarly, excluding non-EU citizens or imposing an age requirement would go against the inclusive philosophy underpinning the EU’s commitment to promoting a participatory democracy. Thus, recognizing the rights of both EU citizens and residents is fundamental to the EU's operational ethos.