Why was the Inca Empire defeated? Choose all answers that are correct. A. The Inca learned from the Aztecs’ mistakes and killed every Spaniard they encountered. B. The Spanish sent messages of peace and friendship to the Inca. C. Pizarro sailed down the east coast of South America to Argentina. D. Disease ravaged the Inca Empire. E. Pizarro took Atahualpa hostage and then had him executed..