14) Which of the following cultures were known for the giant mounds they built by piling up earth and shaping it into forms?

A. Mississippians and Natchez

B. Iroquois and Inuit

C. Adena and Hopewell

D. Chavins and Nazca

The answer is C. Adena and Hopewell.

The various cultures collectively termed Mound Builders were inhabitants of North America who, during a 5,000-year period, constructed various styles of earthen mounds for religious and ceremonial, burial, and elite residential purposes. These included the Pre-Columbian cultures of the Archaic period; Woodland period (Adena and Hopewell cultures)