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A
It is not the server's concern
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B
To prevent injury or death and reduce the establishment's and server's liability
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C
To sell more drinks
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D
Only to avoid paperwork
Why this is the answer
Preventing an intoxicated customer from driving is critical both to protect human life — impaired driving causes serious crashes, injuries, and deaths — and because the establishment and server can face significant liability (including under dram shop laws) if an over-served customer harms someone. Servers can help by arranging alternative transportation, involving a manager, or in serious cases contacting authorities per house policy. Taking reasonable steps to keep an impaired customer from driving reflects the core responsible-service goal of preventing alcohol-related harm.
Source: Responsible Beverage Service — Preventing Impaired Driving