Land Features- The land is surrounded by water, making trade easy. Water Features- Clean springs, rivers, and lakes fill up Costa Rica, making it a beautiful place to tour, thus bringing in more deals for trade. Natural Resources- Minerals are big in Costa Rica, along with Copper. Industries- Real estate, Tourism, agriculture, manufacturing, and service industries.
While D is also correct, A is most correct. The US government cannot offer public services and other tax fueled services if everyone chooses not to pay.