Which river passenger vessel must have a copy of the vessel's plans permanently displayed?

Correct Answer: Option D — A 1100 GT vessel making daylight excursion trips only

46 CFR 115.900 requires that vessels of 100 gross tons or more, including those on daylight excursion trips, must have a copy of the vessel's plans permanently displayed. This ensures that emergency responders and crew have immediate access to critical structural and arrangement information during an incident.