Answer:
store flood waters
Explanation:
Wetlands are areas where water covers soil all or part of the time. Wetlands are important because they protect and improve water quality, provide fish and wildlife habitats, store floodwaters and maintain surface water flow during dry periods.
Immediately south of the United States is the continent of South America. Africa also lies mostly south of the United States although in the different hemisphere. The same holds for Australia, it is more southern than the United States but not immediately southern of it.
Tariffs, quotas, and subsidies are all examples of free trade.
So the correct answer would be : A) free trade.
Hope this helps.