Which of the following is considered a distraction affecting driving performance?

Distractions affecting driving performance involve any activities that divert a driver's attention from the primary task of operating a vehicle safely. All the options presented—adjusting the radio volume, making phone calls, and eating food—are activities that can distract a driver and impair their focus on the road.

When adjusting the radio volume, a driver may take their eyes off the roadway or become momentarily distracted by the controls. Similarly, phone calls divert attention, whether it's trying to dial a number, holding the phone while talking, or engaging in the conversation itself, which can significantly reduce situational awareness. Eating food also requires the driver to divert their attention from driving, as it often involves using one hand to manage the food and can take eyes off the road.

Since each of these activities has the potential to impair driving performance by distracting the driver, the most comprehensive answer encompasses all of them. Hence, recognizing that multiple distractions can contribute to driving hazards reflects an understanding of safe driving practices.