Quito is the capital city of Ecuador. Here's why:
1. Quito is the capital city of Ecuador, which is a country in South America.
2. It is located in the northern part of the country, in the Andean region.
3. Quito is known for its well-preserved historic center, which was declared a UNESCO World Heritage Site in 1978.
4. The city has a rich history and cultural heritage, making it an important center for politics, culture, and economy in Ecuador.
Therefore, the correct answer is that Quito is the capital city of Ecuador.