The correct answer is A) at the time the garbage was disposed. This is the correct answer because the U.S. Coast Guard regulations require that entries in the Garbage Record Book be made at the time the garbage is discharged or disposed of, not at a later time. Specifically, the regulations state that the Garbage Record Book must contain "the date and time of the discharge or disposal, position of the ship, category of the garbage, and the estimated amount discharged or disposed." Making the entries at the time of disposal ensures an accurate record of the garbage management activities. The other options are incorrect because they do not align with the regulatory requirement to record the information at the time of disposal. Options B, C, and D allow for the entries to be made at a later time, which would not meet the regulatory standard.