ex's are always hard to face, especially when its their fault.

option a - bad. you should at least tell her its not a good idea if you really dont wanna meet up.

option b - try to explain that she hurt you bad, and that you do wanna see her, but you're scared of snapping. and it might not be such a great idea.

option c - good, but you have to try to control yourself. you can just say the same thing i said on option b and do go see her. depending on how hard she hurt you, i really wouldnt though, if it was me. im pretty bitter myself. it took me a couple of years to forgive one of my ex gfs who did something pretty bad too.