The correct answer is C) nations produce specific goods and then trade to obtain things they need.
Specialization among nations encourage interdependence in that nations produce specific goods and then trade to obtain things they need.
Trade brings many benefits to nations. If one nation specializes in something specific and dominates the production, it can export to another nation that needs that product. And vice-versa. That is why trade unites countries because they reach agreements that benefited both nations. One example of the benefits of specialization and trade was NAFTA, (North American Trade Agreement), today known as UMSCA, the United States, Mexico, and Canada Agreement.