A single drink can alter your driving performance by affecting which of the following?

• A. Alertness
• B. Reaction time
• C. None of the above
• D. All of the above

Answer: (D)

Alcohol affects driving by changing how your brain processes information, which directly impacts your ability to drive safely. Even a small amount can dull your alertness, making it harder to notice hazards, signals, or changes in the traffic environment. It also slows your reaction time, so your reflexes to sudden events are delayed. Because both alertness and reaction time can be impaired by a single drink, the overall driving performance is affected. That’s why the option stating both are affected—All of the above—is the best choice.