You are offloading garbage to another ship. Your records must identify that ship by name and show her __________.

Correct Answer: Option C — official number

MARPOL Annex V and 33 CFR 151.55 require that when garbage is discharged to another vessel, the Garbage Record Book must include the name and official number of the receiving ship. This provides a clear audit trail to verify proper disposal and prevent illegal dumping at sea.