The author of the passage mentions Crown and Wills primarily in order to A. Distinguish among different factors that might have caused Chaco potters to alter their pots' decorative designs. B. Introduce new evidence related to the question of why Chaco potters altered their pots' decorative designs. C. Show how one potential explanation for the alteration of Chaco pots has been discounted. D. Present a hypothesis about why Chaco pots were altered to revise their decorative designs. E. Explain how archaeologists discerned the method by which Chaco pots were originally decorated.