froginmythroat (FIMT)

Once upon a time, in a land far away away, their was a merchant and his daughter. The merchant had fallen on hard times and had to borrow a large sum from a moneylender. After a year had passed the merchant was still in debt and had no way of paying the money back. So the moneylender proposed a way to cancel his debt. He suggested that he offer the merchant a bag containing two stones, one black and one white. His daughter must select a stone from the bag, if she chooses the black one the debt is cancelled, if she chooses the white one the debt is cancelled but she must marry the moneyleader. The merchant agrees, however unbeknown to him, the moneyleader places two white stones in the bag. Reaching into the bag the daughter sees the two white stones. She must select a stone, so what can she do to ensure she doesn’t have to marry the moneyleader and get the debt cancelled?