Which of the following should be the third sentence after the rearrangement?

Directions: Rearrange the following six sentences (1), (2), (3), (4), (5) and (6) in a proper sequence to form a meaningful paragraph and then answer the question given below.

1. It was a cycling race launched in 1903, by Henri Desgrange, a magazine editor in Paris.
2. The Tour de France is a test of human endurance.
3. His idea worked and the magazine boomed.
4. His aim was to boost the circulation of his magazine.
5. He wanted to achieve this by covering every stage of the three week long, 3,500 kilometre long cycling race.
6. Till today, the race remains more popular than he could ever have dreamed.