For work? Really?
I would suggest any of those EXCEPT the bottom pair. If you're hiking around or doing something active, that's obviously another matter entirely. Wear whatever socks you want. But for strolling around town or at work or something, I'd shy away from the last pair. They're a little..... ugly. (In my opinion, so is the penultimate, but that's probably just personal preference).
Of course, I wear ugly-as-f*ck Chaco sandals everywhere, so I'm a) not one to judge, and b) a huge hypocrite, since the thongs or last pair are probably the most comfortable.
If I can plug Chaco one more time: they've got great arch support. I live in flip flops, and I developed plantar fasciitis because of the lack of support in most pairs. Chaco does NOT have that problem, and they'll re-sole and re-strap for free -- lifetime warranty!