TOEFL Listening: ETS-TOEFL听力机经 - Y6VQGE94H_3ZUE44P$

What does the professor mainly discuss? A. Weaknesses that led to the fall of the Inca Empire. B. Characteristic of the Inca Empire at its mediocre C. Factors that led to rise of the Inca Empire. D. The leadership qualities of two Inca rulers.