Step 1: Context of the European Union's Formation
The European Union (EU) was established under the Maastricht Treaty, which came into force on November 1, 1993. However, the treaty was signed on November 7, 1991, marking the formation of the EU as a formal political and economic union of European countries. This was a significant step forward from the European Economic Community (EEC).
Step 2: Analyzing the Options
- (A) 1990: Incorrect. The European Union was not established in 1990, though there were earlier economic agreements and treaties within Europe.
- (B) 1992: Correct. The Maastricht Treaty was signed in 1992, but the formal establishment of the European Union occurred after the treaty came into effect in 1993.
- (C) 1995: Incorrect. By 1995, the European Union was already in operation, following the signing of the Maastricht Treaty.
- (D) 2000: Incorrect. The European Union was firmly established by 1993 and did not emerge in the year 2000.
Step 3: Conclusion
The correct answer is 1992, which marks the signing of the Maastricht Treaty, the foundation of the European Union.
\[
\boxed{\text{Correct Answer: (B) 1992}}
\]