Which of the following are effects of alcohol on driving ability?

B is the correct answer because alcohol has a significant negative impact on various cognitive and motor functions essential for safe driving. When consumed, alcohol enters the bloodstream and affects the central nervous system, leading to slowed reaction times, which is the interval between perceiving a stimulus and responding appropriately, such as braking or steering. Additionally, alcohol impairs judgment, causing drivers to misjudge distances, speeds, and their own level of impairment. This combination contributes to an increased likelihood of accidents as the driver becomes less able to react effectively to changing road conditions or unexpected events.

In contrast, the other options suggest positive effects that are not accurate. Alcohol does not enhance alertness or focus; rather, it dulls these faculties. Coordination also deteriorates under the influence of alcohol, making physical responses less precise and potentially leading to poor control of the vehicle. Finally, decision-making skills are compromised rather than improved, as alcohol can lead to risky choices and reduced ability to evaluate consequences. Understanding these effects is crucial for recognizing the dangers of drinking and driving.