The top two teams go through, so, realistically, two of Somerset, Glos. and Hants.
In the final round of matches, Somerset are away to Surrey at The Oval, whilst Glos. host Hants at Cheltenham.
Assuming no strange results, Somerset should qualify with a draw and, in reality, Hants would probably need to beat Glos., who are currently ahead of them on points.
As a Somerset fan, I am hoping for a Hants win, as half the points scored in the group games are carried over in to the final group.