Correct answer
The concentration of alcohol in the blood.
Blood alcohol concentration is the concentration of alcohol in the blood, commonly expressed in grams per litre of blood. It is not the total amount of alcohol in the whole body or an amount located in the head. Breath alcohol concentration is expressed in milligrams per litre of air and is a different measurement used in alcohol testing.
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The total amount of alcohol in the entire body, without reference to blood volume.
The concentration of alcohol in the blood.
The amount of alcohol located exclusively in the head.
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