What is the capital city of Argentina?

Buenos Aires is the capital city of Argentina, serving as the country's political, cultural, and economic center. Located along the eastern shore of the Río de la Plata estuary, it is the largest city in Argentina and one of the most populous in South America. Buenos Aires has a rich cultural heritage, blending European influences with local traditions, which is evident in its architecture, cuisine, and arts scene.

The other choices represent major cities in Latin America but are capitals of different countries. Rio de Janeiro, known for its stunning beaches and vibrant Carnival festival, is in Brazil, while Lima is the capital of Peru, notable for its colonial history and gastronomy. Santiago, the capital of Chile, is recognized for its modern skyline and proximity to the Andes mountains. Each of these cities is significant in its own right but does not serve as the capital of Argentina.