How did you get on?
Rules that apply are
In any conditions of visibility
2 - Responsibility
4 - Application
5 - Lookout
6 - Safe Speed
7 - Risk of Collision
8 - Action to avoid Collision
In sight of one another
11 - Application
15 - Crossing Situation
16 - Action by Give Way Vessel
17 - Action by Stand on Vessel
18 - Responsibilities
Whilst some may argue that B is not the stand on vessel, Rule 18 (d)(i) uses the phrase 'avoid impeding the safe passage of a vessel constrained by her draught, the RYA teach the hierarchy as CBD fitting in between NUC and RAM.