Read the following context and choose the best option to answer the question.
Context: I found out a bit of trivia - my former HIgh School tennis coach , Mark Davis , came up with the name for the ride I rode some with Carrolton Cycling Club - I love those guys ... Bob , Brenda , Kerry - you guys rock ! Scott and I rode most of the ride together - 85 miles or so ... Ryan hung with us for 25 miles then * poof * he was gone ! I really planned on going slow ... lol The group of Ryans friends did the first 25 miles in under an hour - I decided to dial it back but at 70 miles I still had an avg .
Question: What may be the reason for their friend disappearing ?
Options: 
A. They rode ahead of them .
B. They had to use the restroom .
C. They are so fast , they could n't be seen .
D. None of the above choices .


A