Answer:
(C) The author bias is that Tour De France is the toughest race in the world.
Step-by-step explanation:
For such a tough race one must have the sufficient physical and the mental strength to win the race. Thus, it is important to check the endurance and the strength of the cyclists to recognise whether they deserve to participate in the race or not. There are various challenges in the competition of Tour De France and thus they check the mental and the physical ability of the participants at its best.