Correct answer
It substantially increases it.
A high blood alcohol concentration impairs perception, reaction and vehicle control and substantially increases risk. A numerical multiplier is not an individual constant: it depends on the population and study method. The prompt states the concentration per litre and does not assign an unsourced universal figure. Do not drive after drinking.
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It substantially increases it.
It does not change the risk.
It reduces it because it improves reflexes.
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