What is the smallest country in Central America?

Which microstate is often described as the world's oldest surviving republic? Which of the following countries is NOT a landlocked microstate? Which country in the Persian Gulf is the smallest country in the Middle East? Which country is an archipelago of 115 islands in the Indian Ocean? Which country in the Caribbean is the smallest English-speaking country in the Americas? Which European country has a population of around 34,000 and covers an area of approximately 61 km²? What is the most populous country in the world? Which country has the second-largest population in the world?