Question

the wto was created
to end tariffs on goods traded with canada.
to end tariffs on goods traded with mexico.
to unify the currencies of european countries.
to help international trade run smoothly.

Explanation:

The World Trade Organization (WTO) aims to facilitate international trade. Ending tariffs with specific countries (Canada or Mexico) is too narrow as its scope is global. Unifying European currencies is the role of the Eurozone. The WTO's main purpose is to ensure smooth international trade through rules, dispute settlement, etc.

Answer:

to help international trade run smoothly.