Explanation:

- Colombo is the largest city in Sri Lanka. It is the commercial, industrial, and cultural hub of the country. The city is known for its modern buildings, colonial architecture, and vibrant markets.

- Correct Answer: Option 1 - Colombo

- Negombo is a smaller city located closer to the Bandaranaike International Airport. It is famous for its beaches and fishing industry.

- Kandy is known for its cultural significance, with the Temple of the Tooth being a major attraction. While it's an important city, it is not the largest.

- Jaffna is located in the northern part of Sri Lanka and has a rich cultural history. It is known for its unique Tamil culture but is smaller in population compared to Colombo.