In Missouri, what is necessary for a rider to have while riding between dusk and dawn?

Answer: D — Functional headlights

Riding a motorcycle during the hours of dusk to dawn requires functional headlights for safety and visibility. In Missouri, as in many other states, it is a legal requirement for motorcycles to have operational headlights to illuminate the road and increase the visibility of the rider to other vehicles. This is crucial during low-light conditions, as it helps prevent accidents by ensuring that both the motorcyclist and other motorists can see one another more clearly. While reflective vests, valid motorcycle permits, and hand signals may be important in different contexts for safety and legal compliance, they do not specifically address the critical need for visibility during nighttime riding. The requirement for functional headlights emphasizes the importance of lighting in ensuring a safe riding experience in the dark.