1. Which of the following is an alleged reason for which knowledge of Native American culture and history is incomplete? a. Lack of sufficient written, Native American sources, O b.C. Vance Haynes' theory on Native American immigration from Asia does not dovetail with all radiometric, carbon-dated objects discovered. O c. Alleged cultural, linguistic and biological ties between Native Americans and indigenous Siberians have not convinced academia universally. O d. European chronicles are alleged by many to be ethnocentric and skewed. O e. All of the Above