What should a motorcyclist do if avoiding an obstacle on the roadway is not possible?

Answer: B — Approach the obstacle at as close to a 90-degree angle as possible

When a motorcyclist faces a situation where avoiding an obstacle is not possible, approaching the obstacle at as close to a 90-degree angle as possible is the best maneuver. This technique allows for better control and stability of the motorcycle as it passes over or near the obstacle. By positioning the motorcycle at a perpendicular angle to the obstacle, the rider minimizes the chances of losing balance or experiencing a collision that could arise from hitting an obstacle at a sharper angle. This approach also helps in distributing weight evenly as the motorcycle moves over the obstacle, contributing to a smoother passage. The other options present less effective strategies. Accelerating to try to jump over the obstacle could lead to loss of control or severe injury if the jump is miscalculated. Braking hard may result in skidding or losing control just before making contact with the obstacle. Leaning away from the obstacle does not provide a tactical advantage and could potentially worsen the situation, especially if it alters the motorcycle's balance. Thus, approaching the obstacle at a 90-degree angle is the safest choice.