The correct answer is - a. sale of exports from Central America is reduced.
When there's recession and financial problems in the United States, that affects the whole region, and even big portions of the world, and Central America is not immune to that. Most of the products that are exported from Central America go to the market of the United States, but when the United States have such economic problems, than the import of certain goods is reduced, and for countries like the ones from the Central American region, it is a big financial blow because it is their main way of having money come into their respective countries.
