Now I think they're all wrong. I would reveal my reasoning, but that wouldn't be very sporting, would it? One of them I'd hoped would the correct one, but then I spotted something in the definition that told me it was a fake. Drat. It would have been a great definition for a word well-needed.

So, I will side with simplicity, with the fact that I have no (i.e., zero) idea what the truth is here, and with the apparent thread that ran among many of the definitions. I cast my vote for:

O