At which blood alcohol concentration (BAC) level can you become an unsafe driver due to impaired judgment and reaction time?

• A. $0.05\%$ or higher
• B. $0.00\%$
• C. $0.01\%$ or lower
• D. $0.20\%$ or higher

Answer: (A)

Verified step by step guidance

1. Understand that Blood Alcohol Concentration (BAC) measures the percentage of alcohol in a person's bloodstream, which affects cognitive and motor functions.
2. Recognize that as BAC increases, impairment in judgment, reaction time, and coordination also increases, leading to unsafe driving conditions.
3. Identify common BAC thresholds used in research and law enforcement to indicate impairment, such as 0.00%, 0.01%, 0.05%, and 0.20%.
4. Recall that many studies and legal standards consider a BAC of 0.05% or higher as the point where significant impairment begins, affecting driving safety.
5. Conclude that the BAC level at which a person becomes an unsafe driver due to impaired judgment and reaction time is 0.05% or higher.