The Weimar Republic was established in Germany in the aftermath of World War I. It was officially founded on February 6, 1919, making option 'C' the correct answer.

Here is a detailed explanation:

Background:
- The Weimar Republic was formed after the abdication of Kaiser Wilhelm II, which marked the end of the German monarchy.
- The abdication was a result of Germany's defeat in World War I and the subsequent political and social unrest in the country.
- The Republic was named after the city of Weimar, where the National Assembly convened to draft a new constitution.

Establishment of the Weimar Republic:
1. The Armistice:
- On November 11, 1918, Germany signed an armistice with the Allies, effectively ending World War I.
- This armistice led to the collapse of the German monarchy and the beginning of the transition to a democratic system.

2. The National Assembly:
- In December 1918, elections were held for a National Assembly, which would be responsible for drafting a new constitution.
- The Assembly convened in Weimar, as Berlin was considered too volatile due to ongoing political unrest.

3. The Weimar Constitution:
- The National Assembly worked on drafting a constitution that would establish a parliamentary democracy in Germany.
- The constitution was adopted on August 11, 1919, and it laid the foundation for the Weimar Republic.

Key Features of the Weimar Republic:
- The Weimar Republic was a democratic system with a parliamentary form of government.
- It granted universal suffrage, allowing all adult citizens, regardless of gender, to vote in elections.
- It established a President as the head of state and a Chancellor as the head of government.
- The Republic also included a bicameral legislature, consisting of the Reichstag (lower house) and the Reichsrat (upper house).

Conclusion:
The Weimar Republic was established in Germany in 1919, following the end of World War I and the abdication of Kaiser Wilhelm II. It was the first attempt at establishing a democratic government in Germany, but it faced numerous challenges, including economic instability and political extremism, which eventually led to its downfall in 1933 with the rise of Adolf Hitler and the Nazi Party.