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A
Bar Alcohol Count; the number of drinks
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B
Blood Alcohol Concentration; the percentage of alcohol in a person's bloodstream
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C
Beverage Alcohol Code; a law
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D
Basic Alcohol Curriculum; a course
Why this is the answer
BAC stands for Blood Alcohol Concentration, which measures the percentage of alcohol in a person's bloodstream. It is the standard measure of intoxication used in laws — for example, the legal limit for driving is commonly 0.08% for adults in most states. BAC rises as a person consumes alcohol faster than their body can eliminate it. While servers cannot measure BAC directly, understanding it helps them appreciate how factors like number of drinks, time, body weight, and food affect a customer's level of impairment.
Source: Responsible Beverage Service — Blood Alcohol Concentration