When slowing down or coming to a stop what should the motorcyclist do?

Answer: B — Downshift.

When slowing down or coming to a stop, downshifting is an important technique for motorcyclists. By downshifting, riders can reduce the motorcycle's speed while maintaining better control of the bike and preparing for a smooth stop. This action helps to match the engine speed to the lower gear, which can improve stability and traction during deceleration. Additionally, downshifting enables the rider to use engine braking, which allows for a more controlled and gradual decrease in speed. This is particularly important in situations where sudden braking may lead to loss of control or skidding. In contrast, solely applying the front brakes can lead to an imbalance and potential loss of control, as the motorcycle may tip forward. Leaning to the left does not contribute to the slowing process and might even be unsafe. Finally, downshifting after stopping negates the benefits of preparing the bike to safely engage with traffic after a stop, as it doesn't help with speed reduction or control while approaching a stop.