Final answer:
The Tour de France consists of 21 stages. It includes various terrains and challenges, and Lance Armstrong was a former participant whose titles were revoked.
Step-by-step explanation:
The Tour de France is famous for its challenging routes and various stages that test the endurance of professional cyclists. The correct answer to how many stages there are in the Tour de France is c) 21. This world-renowned cycling event typically includes 21 stages, covering a wide variety of terrains, including flat road stages, mountain climbs, and time trials, each contributing to the excitement and unpredictability of the race. Noteworthy is that while Lance Armstrong was once a dominant figure in the Tour de France, his titles were stripped due to doping allegations.