Answer:
Option: b. diffusion
Explanation:
The trade networks throughout the entire continent of North America before the arrival of European was vast as they exchanged goods and cultural traits. Native Americans increased interactions which contributed to diffusion. There were exchange and mix of beliefs and customs with other ethnic groups. Anthropologists and archaeologists discovered that in North America, Natives Indians were engaging in trade, including long-distance in areas with a high population, as it was a vital feature of their economy.