TOEFL Reading: ETS-TOEFL阅读机经 - Z53VF054HR1M4ABVL$

According to paragraph 1, why does the written record about the Incan civilization depend on the reports of Spaniards? A. The Incas destroyed their written records to prevent the Spaniards from benefiting from them. B. The Incas did not have a writing system. C. The Spaniards destroyed all records written by the Incas. D. Incan records were written on materials that do not preserve well.