How do I pick out of three girls?

Girl A -met her last year through aim friend gave her my sn and we are close friends we talk about anything and we botb turst each other and she told me im one of her closet friend ands she great and shes likes I would go if I didnt love him ( her x and current boyfriend) I still like her but im not sure what to do.

Girl B- met her casue of a swtich in my classes shes a Senior im a Freshemen we talk a lot espically during that class I have with her she talks to me outside of classes but shes going to college and the semster is almost over but shes great to get to know and I wanan get to get to know her more and I do like here in that way what to do.

And finally Theres a girl in my 3rd period who I am instently accrted to her shes really pretty but I’ve only talked to her once and I wanan get to know and the semster class I have with her is almost over whaat to do ?