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The measurement of the concentration of alcohol in one's bloodstream, expressed as a percentage is known as _____.

  1. Blood alcohol level (BAL)

  2. Blood alcohol content (BAC)

  3. Alcohol intake ratio (AIR)

  4. Alcohol concentration factor (ACF)

The correct answer is: Blood alcohol content (BAC)

The correct answer is B. Blood alcohol content (BAC). This term is used to measure the concentration of alcohol in a person's bloodstream and is typically expressed as a percentage. It is an important factor in determining a person's level of intoxication and impairment. The other options are not correct: A. Blood alcohol level (BAL) is not the standard terminology used to measure alcohol concentration in the bloodstream. C. Alcohol intake ratio (AIR) is not a standard term used to measure alcohol concentration in the bloodstream. D. Alcohol concentration factor (ACF) is not the correct term for measuring alcohol concentration in the bloodstream.