If you want to look at this from a multiverse standpoint I feel it would be something like this-
Track A, which we're watching up until the C comes through the rift: TNG as we've known it to that point. No Sela. The C was destroyed at Narendra Three.
Track B: The war timeline. The C disappeared in the past and reappears in the future (you could make a case for another alternate timeline where the C appears versus one where it doesn't, I suppose). The D protects it while it's sent back and is ultimately destroyed. Things continue to go badly, because the C ends up in...
Track C: A variant of Track A in which Sela has always existed and the C was destroyed at Narendra Three. The D observes a rift but nothing comes through.