If a Slippery Slope Argument Predicts an Undesirable Outcome, and Then

If a slippery slope argument predicts an undesirable outcome, and then that outcome does not occur, does that show that the argument committed the slippery slope fallacy?

A) No, because the prediction might have been based on good evidence.
B) No, because we can never rule out the possibility that the prediction will come true later.
C) Yes, because all predictions of undesirable outcomes commit the slippery slope fallacy.
D) Yes, because all false predictions commit the slippery slope fallacy.
E) Yes, because all slippery slope fallacies make false predictions.