How does a high BAC affect driving ability?

Answer: C — It impairs driving ability

A high blood alcohol concentration (BAC) significantly impairs driving ability due to its effects on the central nervous system. Alcohol affects key functions that are critical to safe driving, including judgment, coordination, reaction time, and the ability to concentrate. When BAC levels rise, drivers may experience decreased motor skills, slower cognitive processing, and an inaccurate perception of their surroundings. This impairment increases the likelihood of making poor decisions, failing to react appropriately to hazards, and losing control of the vehicle, ultimately leading to a higher risk of accidents. In contrast, options that suggest improvement in driving performance or no effect at all do not align with scientific research and data on alcohol impairment. High BAC levels consistently prove to hinder a driver's capabilities, making the correct understanding of its impact vital for promoting safe driving practices.