Where is the Native American pyramid now known as Monks Mound?

Where is the Native American pyramid now known as Monks Mound?

A Illinois
B Mexico
C Guatemala

The people who created Monks Mound were from the civilization known as the Mississippian culture, which flourished in what is now the Midwestern, Eastern, and Southeastern United States from about 800 CE to 1600 CE. Monks Mound is the largest pyramid north of Mesoamerica—at its base, it’s roughly the same size as the Great Pyramid of Giza in Egypt.

The correct answer is Illinois.