Final answer:
The passage is written to tell about an important historic site, the Etowah Indian Mounds Historic Site in Georgia, and provide information about its significance and the research conducted there.
Step-by-step explanation:
The author MOST LIKELY wrote this passage to B) tell about an important historic site. The passage provides information about the Etowah Indian Mounds Historic Site in Georgia, which is described as one of the most well-preserved examples of Native American society in the United States. It also explains the significance of the mounds and their various purposes, as well as the scientific research conducted at the site.