How does alcohol affect a driver's abilities?

Answer: C — It slows reflexes and reaction time

Alcohol significantly impairs a driver’s abilities, most notably by slowing reflexes and reaction time. When a person consumes alcohol, it affects the central nervous system, which is responsible for coordinating movements and processing information. This impairment can lead to delayed responses to critical driving situations, such as reacting to traffic signals, sudden obstacles, or changes in the behavior of other road users. In contrast, the other options present misconceptions about alcohol's effects. For instance, alcohol does not improve judgment; rather, it often leads to poor decision-making. The notion that it can wake someone up is misleading, as alcohol is a depressant that can induce drowsiness and reduce awareness. Lastly, alcohol certainly has a detrimental effect on driving abilities, contradicting the idea that it has no effect at all. Understanding these impacts is crucial for recognizing the dangers of driving under the influence.