Which dress should I wear to the bat mitzvah?

They are appropriate... I was the banquet manager for a Kosher caterer for 10 yrs & have a daughter that goes to Bar/bat mitzvah s often. I like #1 or #5, they are a bit more sophisticated than the others which to me look a little cheap. I noticed you had asked a question earlier about dress suggestions and I was just in JC Penney at the Monmouth Mall in NJ and saw some really great dresses in the lime green shades you mentioned that were all under $80. The website has only a few choices in the juniors section (click on view all dresses) the store has so many! Good Luck.