As the Blood Alcohol Concentration (BAC) increases, what happens to a driver's capabilities?

Answer: B — Judgment and self-control are affected.

As Blood Alcohol Concentration (BAC) increases, a driver's judgment and self-control are significantly impaired. Alcohol affects the central nervous system, leading to a reduction in cognitive functions, which includes the ability to make sound decisions and maintain self-discipline. This impairment results in a higher likelihood of risky behaviors, such as speeding, aggressive driving, and misjudging safe distances from other vehicles, thus leading to dangerous driving situations. Increased BAC levels can also cloud a person's judgment, causing them to underestimate dangers or overestimate their own ability to operate a vehicle safely. The combination of reduced self-control and poor judgment can result in poor decision-making on the road, contributing to the possibility of accidents. While other options suggest improvements in driving capabilities or unchanged effects, they don't reflect the reality of how alcohol impacts a driver's ability. The correct answer highlights the critical areas of impairment that occur with higher BAC levels.