Variations in the Pharyngeal Jaws Between Species of Cichlids Have

Variations in the pharyngeal jaws between species of cichlids have contributed to an adaptive radiation by these fishes because ________.

A) pharyngeal jaws permit the cichlids to efficiently eat only other fish
B) pharyngeal jaws permit enhanced respiration in the Rift Lakes of East Africa
C) the different pharyngeal jaws found in each cichlid species permit diet specialization
D) pharyngeal jaws are the basis of mate selection that leads to speciation