I wouldn't buy any of those.
...
I would find a low cost used mountain bike that fits you.
The Jamis (the green and white one) is a mountain bike. You can tell by the fact that it's got a
suspension fork.
So, the good news is that all three bikes in the picture -- a Jamis, a Raleigh, and (if GuitarStv is correct) a Peugeot -- are decent-quality "bike-shop" bikes, not department store "bicycle-shaped objects." The bad news is, that's about all they have going for them.
The red and black frames are likely to be 700c wheels and the mountain bike is likely to be 26", so I would expect that wheelset to fit one or two of the bikes, but not all three (and it would only even fit two if the Pugeot and Raleigh both have friction rear derailleurs, or the same number of gears if they're indexed -- but they look pretty old, so that might be likely).
At the minimum, they're all going to have to be
completely disassembled and rebuilt, and you're very likely going to have to replace a bunch of parts. There
might be enough non-rusted, compatible parts to assemble a working bike, but I wouldn't count on it.
If you're looking for a project and you have a basement or somewhere to store these in, offering the guy maybe $40 max (unless they've only been outside for a couple of days and aren't rusty yet) might be a good deal. But only if you want bike rebuilding to be your new hobby.