What should a properly adjusted rearview mirror show?

Answer: C — The road behind and to the side of your motorcycle

A properly adjusted rearview mirror is essential for safe riding, as it allows the motorcycle operator to maintain awareness of their surroundings. The correct answer indicates that the rearview mirror should provide a clear view of both the road behind and the road to the side of the motorcycle. This dual visibility enables the rider to monitor approaching vehicles from behind as well as those that may be in adjacent lanes or side streets, thereby enhancing situational awareness. By having an effective scope of view, riders can make informed decisions about lane changes, merges, and other maneuvers, which is crucial for accident prevention. This means the mirror not only serves the purpose of seeing what is directly behind but also allows riders to see alongside their motorcycle to be fully aware of surrounding traffic. Proper adjustment is key; if the mirror only shows one angle, such as directly behind the motorcycle, important avenues of visibility are compromised.