单选题

A They are not competing with each other.

B They have to pay a high fee.

C They tend to be beginning cyclists.

D Most of them fail to finish the route.

解析：
[考点]细节题。女士在对话中提到“But the whole point is that there is no rush. It’s not a race.”表明大家都不用急着走完全程，这不是一场竞赛。A项与之意思相符。