I vote for a variation on B. I played with a few different slockets awhile ago and my experience fit with what I'd found others had posted (way back when people were buying them for their then-current P3s). A lot of them are junk or nearly so. Yours might not support chips over a certain speed. I was testing dual 1GHz chips in several boards and the only slockets that I found that worked in all boards and worked with dual processors were made by ASUS. S370-D I think. Sounds like you don't care about dual processor compatibility but the quality issue might be your problem.

With it being free you're out nothing as long as you don't fry your CPUs or motherboard - I lost one CPU on the second slocket I tried and had to replace it, would have been really pissed had I lost the motherboard. If you don't get this one to work don't buy some $3 one off ebay and think it will. If you get it from an owner who actually used it then you're in good shape. If you buy it new from some business that lists dirt cheap, crappy parts then don't count on it.