Which Treaty was resisted by Denmark and Sweden as an Euro-skeptic response to European Union's integrationist agenda?

Maastritcht Treaty

The correct answer is Option (2) → Maastritcht Treaty

"...As a supranational organi sation, the EU is able to intervene in economic, political and social areas. But in many areas its member states have their own foreign relations and defence policies that are often at odds with each other. Thus, Britain’s Prime Minister Tony Blair was America’s partner in the Iraq invasion, and many of the EU’s newer members made up the US-led ‘coalition of the willing’ whereas Germany and France opposed American policy. There is also a deep-seated ‘Euro skepticism’ in some parts  of Europe about the EU’s integrationist agenda. Thus, for example, Britain’s former prime minister, Margaret Thatcher, kept the UK out of the European Market. Denmark and Sweden have resisted the Maastricht Treaty and the adoption of the euro, the common European currency. This limits the ability of the EU to act in matters of foreign relations and defence."