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Question:

If you are at least 21 years old and your alcohol concentration (AC) is ______ or above, you are considered legally under the influence of alcohol.

A 0.08%
Explaination

You are considered legally under the influence of alcohol if either (1) you are at least 21 years old and your alcohol concentration (AC) is 0.08% or above; or (2) you are under 21 and your AC is 0.02% or above. If you're convicted of driving under the influence, you may face harsh penalties.