I'd go further than some other posters have suggested, and crop #3 (from the bottom) all the way down to a square.
Interestingly, it was #2, the one that no one else has spoken up for, that grabbed me initially. The light is a little more even than in the other two, and I think that works well---it makes it into a picture of the stairs as an object, rather than "stairs leading somewhere". On reflection, I think the composition of that one doesn't work so well, but the interaction of light and subject is a winner.
I think there's no shame in having an inexplicable subject that grabs you. For me it's doors, with the proviso that you can't see the other side---they can be closed, or slightly open, or the other side can be too dark or too light to be distinguished, but if the viewer can see beyond the door, it doesn't push my buttons. Who knows why; I just run with it and figure that my future descendants can ask themselves "What the heck was it with Great-Grandpa and doors, anyway?"