Which institutions in Europe and Asia provided alternative solutions to a Unipolar world after the disintegration of the USSR?

The EU and ASEAN.

The correct answer is Option 1 - The EU and ASEAN.

After the end of the bipolar structure of world politics in the early 1990s, it became clear that alternative centres of political and economic power could limit America’s dominance. Thus, in Europe, the European Union (EU) and, in Asia, the Association of South East Asian Nations (ASEAN), have emerged as forces to reckon with. While evolving regional solutions to their historical enmities and weaknesses, both the EU and the ASEAN have developed alternative institutions and conventions that build a more peaceful and cooperative regional order and have transformed the countries in the region into prosperous economies.