**The Method of Amending the Constitution by Popular Veto in Switzerland**

The correct answer to the question is option 'B', Switzerland. Switzerland is known for its unique system of direct democracy, which allows citizens to have a direct say in the legislative process, including the amendment of the Swiss Constitution.

**Direct Democracy in Switzerland:**
Switzerland is often referred to as the "cradle of direct democracy" due to its extensive use of direct democratic mechanisms. Unlike representative democracies, where citizens elect representatives to make decisions on their behalf, Switzerland allows citizens to directly participate in decision-making.

**Popular Veto in Switzerland:**
The method of amending the Constitution by popular veto is a key aspect of Switzerland's direct democracy system. In Switzerland, citizens have the power to propose amendments to the Constitution through popular initiatives. A popular initiative is a process in which a certain number of citizens can gather signatures to put forward a proposal for a constitutional amendment.

**Procedure for Popular Veto:**
Here is a step-by-step procedure for the popular veto method of amending the Constitution in Switzerland:

1. Proposal: Any citizen or group of citizens in Switzerland can propose a constitutional amendment by formulating a text and collecting a required number of signatures within a specific timeframe. The required number of signatures varies depending on the level of government (federal or cantonal) and the specific issue at hand.

2. Verification: Once the required number of signatures is collected, the proposal is submitted to the authorities for verification. The signatures are checked for validity and authenticity.

3. Referendum: If the proposal passes the verification process, it is put forward for a national or cantonal referendum. During the referendum, Swiss citizens have the opportunity to vote in favor or against the proposed constitutional amendment.

4. Majority Rule: For a popular veto to be successful, the proposed constitutional amendment must receive both a majority of the overall votes cast and a majority of the votes in at least half of the cantons. This ensures that the interests of both the majority and the diverse cantons are taken into account.

5. Constitutional Amendment: If the proposed amendment successfully passes the referendum, it becomes part of the Swiss Constitution. The Swiss Constitution is a living document that can be amended through this direct democratic process.

**Advantages of Popular Veto:**
- Provides a direct voice to citizens in the constitutional amendment process.
- Enhances citizens' engagement and participation in democracy.
- Prevents the concentration of power in the hands of a few representatives.
- Allows for the expression of diverse opinions and interests in decision-making.

**Conclusion:**
Switzerland's method of amending the Constitution by popular veto through direct democracy is a unique and effective way of ensuring citizens' participation in the legislative process. It allows Swiss citizens to directly shape their country's constitutional framework and reinforces the principles of democracy and popular sovereignty.