The correct answer is B) unhealthy relations between countries.
The scenario that would create a challenge for efficient global trade is unhealthy relations between countries.
Nothing more generate damage between nations that unhealthy relations. If we review the history of wars in recent times, we can confirm this. That is why trade is a good solution to improve the foreign relations of nations. One of the best examples is NAFTA. The North America Free Trade Agreement signed by México, the United States, and Canada. This agreement has helped to solidify the relationships between these three countries and has improved the economy of the three. In recent days, NAFTA changed to USMCA, the United States, México, and Canda Agreement.
Most hills are "B. Not steep", since for it to be a hill it needs to be somewhere in between the elevation of flat land and mountainous land, which of course is much higher and usually steeper.
