trash aaa, keep ccc, and i would keep bbb incase you need a hdd for something.
IMO, all of them. For the same amount of power usage you are getting 0.080TB (80Gb) of data storage at best and 1TB drives are phenominally cheap these days. They probably don't have much life left in them anyway.
On the other hand, they could all make good paper weights if you need them.