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A
Serve them anyway
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B
Refuse service and follow procedures, which in some places may include confiscating the ID or notifying authorities
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C
Keep it as a souvenir
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D
Apologize and serve them
Why this is the answer
If staff discover a patron is using a fake ID, a reasonable approach — guided by house policy and local law — is to refuse service and follow the established procedures, which in some jurisdictions may permit or require confiscating the fake ID and/or notifying authorities. Staff should not serve the patron, and should avoid risky confrontation. Because the specific rights and obligations regarding fake IDs vary by location, managers should ensure staff know their establishment's exact procedure. The constant across all jurisdictions is that the person must not be served alcohol.
Source: Responsible Beverage Service — Fake ID Procedures