'''Aventus''': ''"You don't have to say anything. There's no need. You're here, so I know you'll accept my contract."''
Each path leads to asking about the contract, to which Aventus will reply, ''"My mother, she... she died. I... I'm all alone now. So they sent me to that terrible orphanage in Riften. Honorhall. The headmistress is an evil, cruel woman. They call her Grelod the Kind. But she's not kind. She's terrible. To all of us. So I ran away, and came home. And performed the Black Sacrament.
And now you're here . And you can kill Grelod the Kind!"''
Before you leave, you can talk to Aventus for more information, such as the reward and a bit of his back story: