Which of the following is a common factor that can contribute to distraction while riding?

Cell phones are a common factor that significantly contributes to distraction while riding. Using a phone while operating a motorcycle takes attention away from the road, which is critical for safe riding. The act of texting, making calls, or even just checking notifications can impair a rider's ability to react to hazards, assess surroundings, and maintain proper control of the motorcycle.

In contrast, listening to music may also cause distraction, but it can vary in impact based on volume and the rider's familiarity with their environment. Wearing a helmet is essential for safety and does not distract; rather, it protects the rider. Regular check-ups are beneficial for maintenance and safety but do not contribute to distraction while riding. Thus, cell phones stand out as a leading risk factor for distractions that can compromise the safety of motorcyclists.