Genetic Analysis Suggests That Hagfishes and Lampreys May Be Sister

Genetic analysis suggests that hagfishes and lampreys may be sister groups.Which statement best supports the idea that hagfishes are vertebrates?

A) Hagfishes have cartilaginous skeletons, which may be a derived morphological feature.
B) Hagfishes have a partial cranium.
C) Hagfishes exhibit pharyngeal slits into adulthood.
D) Hagfishes undergo direct development.
E) Hagfishes have a tonguelike structure equipped with toothlike rasps.