All this time I was thinking that D was the most likely scenario. Or maybe that's just a result of being in Ethereum when the DAO fork hit, and initially ETC had almost no value.

Actually, ETH/ETC is another good example, because naively one would think that ETC would initially have no basis. Or alternately that ETC is the original currency and ETH is the new one. And so on.

In any case, I can't imagine this not ending up in court at some point, given the amount of money conceivably at stake.