The sentence tht best explains how the historical description of subject matter enhances the meaning of the mythical description is C. It supports the myth by providing facts about how the Kiowas first named themselves with words that mean "coming out".
The author adopts the tone of a historian to explain the origins of the Kiowas, giving an explanation to the myth that has been passing from one generation to the next.
It iuses imagery to express a desire for the melding of the natural world (mammals, pure water, clear sky) with the artificial (cybernetic, computers, programming) in "harmony".
