When checking the pronunciation of the letter 'V', where should the incisal edges of the maxillary anterior teeth contact the lower lip?

A) Inner (wet) surface of the lower lip — CORRECT.
For labiodental sounds ('F' and 'V'), the incisal edges of the maxillary incisors should lightly contact the inner/wet surface (mucosal side) of the lower lip. This is used clinically to verify proper vertical dimension and incisal edge position in complete denture patients.
B) Middle of the vermillion border: Would suggest teeth that are too long or positioned too far anteriorly.
C) Outer dry surface: Indicates teeth are excessively long or the VDO is too great.
D) No contact: Would suggest teeth are too short or set too far posteriorly.