It is illegal to drive with a blood alcohol concentration of----- or more.

• A. 0.10% or more
• B. 0.08% or more
• C. 0.05% or more
• D. 0.15% or more

Answer: (B)

Driving with a blood alcohol concentration at or above 0.08% is illegal because alcohol starts to noticeably impair the abilities needed to operate a vehicle safely—slower reaction times, reduced coordination, poorer judgment, and degraded vision. At this level, the risk of a crash rises significantly, so laws set 0.08% as the clear, measurable threshold that makes a driver legally impaired. Keep in mind that some groups have stricter rules (like commercial drivers or minors), and even below this limit, alcohol can affect driving. The other listed levels aren’t the standard legal boundary in most places, which is why 0.08% or more is the correct threshold.