Answer: C

Reasoning: In Ricketts’ esthetic (E-) plane—drawn from the tip of the nose (Prn) to the soft-tissue pogonion—the ideal Caucasian soft-tissue relationship places the lower lip about 2 mm behind (posterior to) that straight line; the upper lip should lie roughly 4 mm behind it. This 2-mm retrusion of the lower lip is consistently quoted in orthodontic cephalometric literature evaluating lip position relative to the E-line [Buschang, 2011, PMID 21299383].