Hurry! Lisa Bergren needs your help!

Author Lisa T. Bergren asked me to post this on my blog. She has three choices for the cover of her upcoming book, Waterfall, and needs your thoughts on the best cover. If you would like to give input, you can leave a comment on this post, or you can request her friendship on facebook and vote from there (In her pictures in the folder "wall photos"). Please tell which cover you like best and why. (She needs input by Monday or Tuesday so please don't wait to post your thoughts.) Thanks for all your help!

Here is a blurb for the book:
Waterfall is the first in the River of Time trilogy by Lisa T. Bergren. The Bentarrini girls have spent every summer of their lives in Italy with their archeologist parents, but this summer is most definitely different. In a bizarre moment, the girls catapult through time and end up in medieval Italy, in the midst of a battle between knights. And after that, every day becomes a battle to get home...and becomes a terrible choice about if they want to get home at all. Action, romance, and heroes and heroines every reader will fall for, this is teen fiction at its best.