From that bit of green, I'd say that one is still alive anyway. But they might be damaged... I don't particularly agree with the advice you were given about how to let them go through the winter. There are lots of articles on this forum about winter protection (try a search with the terms "winter" "protection", or some similar terms). If the roots survived, and with that green, they should awaken. Give them water and sunlight... you'll want to water them well (so that it runs right out of the bottom of the pots), but then don't keep them sopping or soggy... before you water them again you should let them get to the point where the soil is just slightly moist (stick a finger into the dirt to check). I hope this helps... and good luck!
Mike
p.s. for winter protection, you'll need to keep them out of the wind, and possibly a bit warmer. Do you have a garage or shed?