The plan was that H , V and I were going to stick together and ride it at a casual speed . We did just that , rolling along the trails at a good speed , overtaking people from time to time on the uphills and going moderately on the downhills . The trails were great . Not too difficult , but not too easy .
What were they using to ride the trail ?
Pick the best answer from the following options:
- A bicycle .
 - Roller blades .
 - A scooter .
 - A skateboard .


A bicycle .