Past here can be seen as a matter of how their class background influenced their reaction -- as that seemed to determine how much they knew, and how soon they realized, about what was going in. Benita is a largely uneducated rural villager of a relatively poor family; she is apolitical, ignorant and content to show off her uniform and model German womanhood, and she's not interested in letting Connie open her eyes to the truth; he's just a handsome officer who can give her a good lifestyle. Ania is educated but sheltered as the daughter of a doctor; she wants to escape an oppressive home and latches onto Rainer and his enthusiasm for the cause, wanting to believe in it, deceiving herself for a long time even as a part of her is questioning and critical, and ultimately, she does figure out what's going on. She attempts to escape, again through acts of deception. She guiltily realizes her own complicity, too, in looking back to her childhood betrayal of her young Jewish neighbor, but all of her wits are applied to survival for herself and her sons. Marianne's past we learn less about, but enough to see that she grew up in a privileged world, friends with the upper class men whom she would later associate with as the wife of the Countess's nephew and heir. She's in a position to meet many movers and shakers and figure out what's going on from the start, and then to act out of her moral outrage. Each woman represents some portion of German society as a whole, I gather.