Countries met at San Francisco to sign a charter

The correct answer is option 'B' - 50.

Explanation:
The event in question is the signing of the United Nations Charter, which took place in San Francisco, California, in 1945. The United Nations (UN) is an international organization founded to promote peace, security, and cooperation among nations.

Here is a detailed explanation of the answer:

1. United Nations Charter:
- The United Nations Charter is the foundational document of the United Nations.
- It was signed on June 26, 1945, in San Francisco.
- The Charter established the UN as an international organization and outlined its purposes, principles, and structure.

2. Participants at the signing:
- Representatives from various countries participated in the signing ceremony.
- A total of 50 countries were represented at the conference in San Francisco.
- These countries included the victorious Allied Powers of World War II, as well as other nations from different regions of the world.

3. Purpose of the conference:
- The primary objective of the conference was to establish an international organization that would prevent future wars and promote peace and cooperation among nations.
- The participating countries aimed to create an organization that would address global issues, encourage diplomacy, and provide a platform for international cooperation.

4. Formation of the United Nations:
- The United Nations was officially formed on October 24, 1945, when the Charter came into effect.
- The organization replaced the ineffective League of Nations, which had been established after World War I but failed to prevent the outbreak of World War II.

5. Membership of the United Nations:
- Over time, the membership of the United Nations has expanded significantly.
- Currently, there are 193 member states in the UN, encompassing almost all recognized sovereign nations in the world.

In conclusion, 50 countries met at San Francisco to sign the United Nations Charter in 1945. The signing of the Charter laid the foundation for the establishment of the United Nations as an international organization dedicated to promoting peace and cooperation among nations.