What could cause the vehicle to leave the road?

The selected combination is correct because all three factors—distraction, inattention, and tiredness—are critical contributors to losing control of a vehicle and leaving the road. According to German traffic regulations, drivers are required to maintain full attention and control while driving. Distraction, such as using a mobile phone or adjusting the radio, can impair a driver's ability to react to road conditions. Inattention, which can occur when a driver's mind wanders or they fail to monitor their surroundings, also greatly increases the risk of accidents. Finally, tiredness can significantly slow reaction times and impair judgment, making it imperative for drivers to be well-rested before operating a vehicle. All these factors underscore the importance of focused and alert driving to ensure road safety.