In the book of Numbers, what was the purpose of the water of purification (also known as water of bitterness) that was administered to a woman suspected of adultery?

A To cleanse her from the sin of adultery if she was guilty. B To prove her innocence by causing no harm if she was innocent, but causing her abdomen to swell and her thigh to waste away if she was guilty. C To determine her lineage and tribal affiliation. D To provide a means of repentance and reconciliation with her husband.