Context: 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 .
Question: What were they using to ride the trail ?
Option 0: A bicycle .
Option 1: Roller blades .
Option 2: A scooter .
Option 3: A skateboard .
Answer: 0