TOEFL Listening: ETS-TOEFL听力机经 - 46LZ198U1LO3R34IP$

What does the professor imply about the significance of the khipu that were produced by the Norte Chico culture? A. They represent the culture's first attempts at creating fabric. B. They confirm the importance of cotton in the regional economy. C. They suggest that early inhabitants of the region's coastal areas used fishing nets. D. They may constitute one of the earliest known forms of written communication.