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A blood alcohol level of 0.3 g/l means that:
AIn one litre of blood, there are 0.3 grams of pure alcohol.Correct
BOne litre of alcoholic beverage results in 0.3 grams of alcohol in the blood.
CThere is a percentage of 0.3 grams of alcohol for every 10 litres of blood.
Explanation
The blood alcohol level is expressed in grams per litre of blood (g/l). Thus, a level of 0.3 g/l means exactly that, in each litre of the driver's blood, there are 0.3 grams of pure alcohol. The remaining options are incorrect because the measurement is taken per individual litre of blood and not per ten litres, and the level does not directly refer to the volume of alcoholic beverage consumed, which varies from person to person.
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