Answer:
A. Bow
Step-by-step explanation:
Registration number is an evidence or authentication of registration of a vessel or vehicle. This number is very important when an emergency occurs and there is a need to trace the vessel to the owner. And this should be displayed on a vertical surface or a surface where easy view is achievable.
So it is recommended that registration numbers be displayed on the bow of the vessel. The number should be displayed in such a way that it could be read from left to right.