The anicent Native Americans (just as they are today) were a varied peoples, with varied cultures, and varied religious beliefs which can be compared to many other religions from the ancient world. Therefore, the three equally correct answers are: the Mesopotamians, Hyksos, and Egyptians, since those three were all civilizations based around river valleys.
As West African slaves came to new places in the Americans, so did their knowledge. They taught many Americans things they did in Africa, such as farming techniques, old tales and myths, and many more. As people exchanged knowledge the traditions started to grow. A significant crop in South Carolina is rice!
The correct answer is D. Rectangle
All of the other shapes are almost never used by anyone, not only journalists. You can easily check this in any newspaper.
I think it was Aztec, Hope it helps!