Multi-select problem: How does the next paragraph end?

. several bicycle racers dressed in motocross suits and wearing helmets

Choose from:
A). wander around a trails, acodea and down an alley with a trip sign attached to a bike.
B). are lined up at the start line, waiting to race.
C). talk about high dirt bike safety instructions before riding through heavy dirt and into a parking lot.
D). keep going down the track after one another, sometimes individually.
B).