Which Article in the EU's Lisbon Treaty outlines the process for leaving the EU?

The correct answer is Article 50 of the EU's Lisbon Treaty, which specifically details the procedure for a member state to withdraw from the European Union. This article outlines the steps that a country must take to initiate the departure process, including notifying the European Council of its intention to leave. It also allows for negotiations to be conducted regarding the terms of withdrawal, thereby ensuring an orderly exit. Article 50 emphasizes the importance of a member state making its choice to leave, and it sets a framework that establishes a timeline and guidelines for the negotiations that follow. This effectively ensures that the departure is handled in a manner that respects both the withdrawing state and the remaining member states.

The other choices provided do not pertain to the withdrawal process from the EU. Articles 22, 12, and 35 focus on other aspects of EU governance and policy, thus distinguishing Article 50 as the unique and relevant provision addressing the withdrawal mechanism.