Correct Answer - Option 2 : 3, 5, 2, 4, 1
The pattern followed is:-
Arranging the given areas in descending order of their area:
World > Continent > Country > Capital city > Landmark.
3. World
5. Asia
2. Sri Lanka
4. Colombo
1. Khan Clock Tower
Hence, the correct answer is "3, 5, 2, 4, 1".