The large jaws of gorilla species,in addition to a sagittal crest,provide support for:

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The masticatory-functional hypothesis describes the relationship between the size and shape of skulls and the type of food consumed. As gorillas primarily consume tough and fibrous vegetation, their large jaws and sagittal crest provide support for the masticatory-functional hypothesis. The temporalis-functional hypothesis (A) relates to the shape of the human skull and the forces generated by the temporalis muscle during chewing, and is not relevant to gorillas. Choice (C) is incorrect as the masticatory-functional hypothesis suggests that tough foods result in larger jaw size, not soft foods.

The Large Jaws of Gorilla Species,in Addition to a Sagittal