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Question:

For California drivers 21 years of age or older, it is illegal to drive with a blood alcohol concentration (BAC) of

A 0.08%.
Explaination

For California drivers 21 or older, it is illegal to drive with a blood alcohol concentration (BAC) of 0.08% or more. [Get a DUI- Lose Your License, Alcohol/Drugs and Driving is Dangerous, Alcohol and Drugs, California Driver Handbook]