Final answer:
The author most likely used oral histories and interviews with tribal elders as the main reference in her paper on the 'Stomp dance and the Green Corn religion' considering the emphasis on the value, preservation, and authenticity of oral traditions within Eastern Woodland tribes.
Step-by-step explanation:
The author of "Stomp dance and the Green Corn religion of the Eastern Woodland tribes in Oklahoma" primarily used oral histories and interviews with tribal elders as a major reference in her paper. Considering the context provided that discusses the value placed on oral histories by different scholars and the fact that Indigenous communities often critique the legitimacy of ethnographic notes, it is evident that firsthand accounts from those within the community hold significant importance.
Additionally, the use of oral histories as a method for preserving traditions and cultures, especially as they can be reflected in current archaeological and historical research, suggests that option A, oral histories and interviews with tribal elders, would be the main resource utilized.