I did not mean for the open-ended scoring with B/C/D to imply that more than one AI is accessible without crossing an ocean. I modified OP to make this explicit.
Yes, only one cap is available to B. I knew that when I posted, but I did not want to give up that detail.
Yes, avoiding Navigation after Astronomy does provide more flexibility for C. But I am not sure I would characterize that as
very possible. More like just barely
remotely possible!
Full marks for the A/E/F/G achievements is 12 points. And B/C/D has just 5 points available, not 21 points! A 100% score on this map is 17 points.