I think C is the best pin but open to hearing others thoughts.
I actually like A better because it seems like you have no real bailout and consequently might bring water into play more, but at that distance it's still a flag you can attack. C is definitely my 2nd choice though, B and D seem really meh to me, but I can definitely see one of those being a location one of the days and it wouldn't bother me. For sunday though it definitely needs a location by the water.
Also I love the idea as I'm sure most fans would, but I wonder how the players will react to it.
I don't think anyone goes at pin C. It will just be shots to the fat part and a manageable bunker shot if they tug it a little. I think A brings in the most risk/reward and D brings in a lot of bogeys from the bunkers, which actually can make the target from the tee smaller and closer to the water as players need to avoid short siding themselves
Saw last night the one kid hit his approach into a nasty bunker then the 15 year old waggled for 10 minutes and had the entire green to hit and probably end up winning the hole and he hits it into the same bunker. Turned it off.