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 regulate and facilitate international trade. It is not focused on trade - tariffs with just Canada or Mexico specifically, nor on unifying European currencies (which is the role of the Eurozone and the European Central Bank). Its main goal is to help international trade run smoothly by setting rules for trade among its member countries.

Answer:

to help international trade run smoothly