Why is the European Union, created in 1993, important to the economies of Europe?

I believe the answer is the first one, it created a cooperative trade zone.

Here are why the other ones are incorrect:

2. NATO was the organization that created a strong military alliance in Europe following WWII

3. The EU isn’t made up of oil cartels, and that would not be good for Europe if it was true.

4. I believe the EU has important regulations, but doesn’t limit imports to European nations from non-EU countries, since that would not be beneficial for the country(s) importing products.

Hope this helps!

The answer to this question is  c. pharmaceutical accumulation  reclaimed water refers to the water that being used again after it already  used for agricultural purposes.this type of water often contains pharmaceutical accumulation because of the chemical fertilizer that is used for the plants is absorbed into the water.