Which of the following compares the prominence of the chin compared with the prominence of the lower incisors?

The prominence of the chin (pogonion) compared with the prominence of the lower incisor establishes the balance between them: the more prominent the chin, the more prominent the incisor can be, and vice versa. This important relationship is often referred to as the Holdaway ratio. Ref: Contemporary orthodontics, William Proffit, 4th edition page 209