Which Ibero-American country is landlocked?

Bolivia is the correct response because it is one of the two landlocked countries in South America, meaning it does not have any coastline along an ocean. After losing its coastal territory to Chile in the War of the Pacific (1879-1884), Bolivia became sandwiched between Brazil to the northeast, Paraguay to the southeast, Argentina to the south, and Chile and Peru to the west, making it reliant on neighboring countries for access to maritime trade routes.

In contrast, Brazil, Chile, and Argentina all have coastlines that allow for direct access to the ocean. Brazil occupies a large area along the eastern part of the continent with extensive coastlines along the Atlantic Ocean. Argentina also has an Atlantic coastline and is located to the southeast of Bolivia. Chile, situated to the west of Bolivia, has a long stretch of coastline along the Pacific Ocean. Thus, Bolivia stands out as the only landlocked country among the options presented.