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A
It is not important
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B
Intoxication develops over time, and signs may appear gradually as alcohol accumulates
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C
Customers never change
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D
Only the first drink matters
Why this is the answer
It is important to monitor customers throughout their visit because intoxication develops over time as alcohol accumulates in the bloodstream faster than the body eliminates it. A customer who seemed fine on arrival may show signs of impairment after several drinks, and there is often a delay between the last drink and its full effect. By observing customers continuously — their drink count, pace, and behavior — servers can recognize rising intoxication and intervene by slowing or stopping service before the person becomes obviously impaired or a danger.
Source: Responsible Beverage Service — Ongoing Monitoring