When riding in a group, what is the best formation?

Answer: B — Staggered formation

When riding in a group, the best formation is a staggered formation, which is the correct answer. In a staggered formation, each rider keeps a safe distance from the rider in front of them while staying in the same lane. This formation allows for better visibility, maneuverability, and reaction time in case of emergencies. It also helps prevent collisions between riders and provides space for each rider to react independently to road hazards. Single file formation may reduce the group's visibility, side-by-side formation is not recommended due to reduced space and potential for collisions, while a diamond formation is not ideal for group riding on regular roads.