BOTH INTERNATIONAL & INLAND Which vessel may combine her sidelights and stern light in one lantern on the fore and aft centerline of the vessel?

Correct Answer: Option B — A 16-meter sailing vessel

Rule 25(c) permits a sailing vessel of less than 20 meters in length to combine its sidelights and sternlight in one lantern carried at or near the top of the mast where it can best be seen. This exception simplifies lighting requirements for smaller vessels operating under sail.