How should a rider position themselves on a motorcycle?

The correct answer emphasizes the proper riding position for safety and control while operating a motorcycle. Sitting astride the seat, facing forward, with one leg on each side allows the rider to maintain balance and stability. This position is crucial for effective steering, braking, and maneuvering the motorcycle. It also enables the rider to properly engage their feet with the footpegs or foot controls, ensuring they can use the brakes and accelerator efficiently.

Additionally, sitting upright with a clear view of the road is essential for awareness of surroundings, helping to anticipate potential hazards. This riding position also distributes the rider's weight evenly, which improves handling and reduces the risk of accidents. By facing forward, the rider can react promptly to changes in traffic and road conditions, enhancing overall safety.

In contrast, the other options present unsafe riding positions that would significantly compromise the rider's ability to control the motorcycle and react to situations on the road. For instance, sitting sideways or straddle-sitting facing backward would severely limit visibility and balance, while lying flat would eliminate control over the motorcycle entirely. Therefore, the proper riding position is crucial for both safety and performance on the road.