Squier and Davis Contributed to Investigations of the Moundbuilders By

Squier and Davis contributed to investigations of the Moundbuilders by:

A) intensively and systematically surveying and recording roughly 200 mound sites.
B) being among the first to argue that the Native Americans had indeed built the mounds.
C) remaining objective, avoiding speculations, and ultimately arriving at the truth.
D) All of the answers are correct.