BOTH INTERNATIONAL & INLAND Vessel "A" is overtaking vessel "B" as shown in illustration D017RR below and will pass without changing course. Which light will vessel "A" observe on vessel "B"?

Correct Answer: Option B — white stern light

Rule 13 defines an overtaking vessel as one approaching from more than 22.5 degrees abaft the beam. Rule 25(d) and Rule 26(c) require an overtaking vessel to see the stern light of the vessel being overtaken, which is a white light showing 135 degrees fixed to the stern.