What should you do first when braking on slippery surfaces?

Answer: B — Use the front brake first

When braking on slippery surfaces, using the front brake first is crucial because it provides the most effective stopping power. The front brake engages the front wheel, which is typically where most of the motorcycle's braking force is applied. On slippery surfaces, caution is necessary to prevent losing traction. Applying the front brake helps to maintain stability as you slow down. However, it is important to apply it progressively to avoid locking the wheel and causing a skid. Ideally, the rear brake should be used in conjunction with the front brake, but the front brake should always be applied gently first to maintain control over the motorcycle. Choosing to use only the rear brake can lead to less effective braking, as it doesn't provide as much stopping power. Similarly, applying both brakes simultaneously can be risky if not done with care, as it requires more skill to prevent skidding. Shifting down a gear is not a primary action for slowing down; it can be used to help control your speed and prepare for a stop but is not the first thing to focus on when braking on a slippery surface. Thus, the best practice starts with using the front brake first for optimal control and stopping effectiveness.