Bad question not enough info on B to make this an option. If I have appreciable bearing change to port for a vessel to my port then there is no risk of collision. Same if it was to stbd with stbd bearing change.
Deck
Rules of the Road: BOTH INTERNATIONAL & INLAND Risk of collision may exist __________.
Discussing this exam question.
Rule 7(d) and 83.07(d)
In determining if risk of collision exists the following considerations shall be among those taken into account:
(i) such risk shall be deemed to exist if the compass bearing of an approaching vessel does not appreciably change;
(ii) such risk may sometimes exist even when an appreciable bearing change is evident, particularly when approaching a very large vessel or a tow or when approaching a vessel at close range.
In determining if risk of collision exists the following considerations shall be among those taken into account:
(i) such risk shall be deemed to exist if the compass bearing of an approaching vessel does not appreciably change;
(ii) such risk may sometimes exist even when an appreciable bearing change is evident, particularly when approaching a very large vessel or a tow or when approaching a vessel at close range.