B

The sphenomandibular ligament is a fibrous remnant of Meckel’s cartilage, which originates from the first (mandibular) pharyngeal arch; the other listed structures come from the second arch (Reichert’s cartilage) [Ishizeki et al., 2001, PMID 11383888; Cheynet et al., 2003, PMID 12802513].