How should passengers behave to ensure safety while riding?

Answer: B — Lean as the rider leans

Passengers should lean as the rider leans to maintain balance and stability on the motorcycle. This coordinated movement helps the motorcycle navigate turns and changes in direction more smoothly, preventing potential loss of control. When both the rider and the passenger shift their weight in the same direction, it reduces the risk of unbalanced dynamics that could lead to accidents or falls. In contrast, staying rigid and holding on tight can cause the passenger to be less adaptable to the bike's movements, increasing the chance of imbalance. Keeping feet on the ground is impractical, as it can be dangerous when the motorcycle is in motion. Signaling the rider to stop can be useful in some scenarios, but it doesn’t contribute proactively to maintaining balance or safety while riding. Therefore, the best practice is for the passenger to lean with the rider.