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A
A person with high tolerance is safe to over-serve
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B
Even a person with high tolerance has an elevated BAC and is legally impaired, regardless of how they appear
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C
Tolerance eliminates impairment
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D
Tolerance lowers BAC
Why this is the answer
A person with a high alcohol tolerance may not show obvious signs of intoxication, but their blood alcohol concentration is still elevated and they are still legally and physically impaired. Tolerance affects how impairment appears, not the actual amount of alcohol in the body or its effect on reaction time and judgment. This is a critical point: servers should not assume a 'seasoned drinker' is safe to keep serving, because the legal limits and harm risks apply regardless of how well someone seems to 'hold their liquor.' Drink count and time still matter.
Source: Responsible Beverage Service — Tolerance