Compare effigy mounds and Nazca Lines. What is one thing that both of these art forms have in common?

A.
Both can be seen from the sky, such as when flying in an airplane.

B.
Both are commonly created in the shape of turtles or other animals with shells.

C.
Both are present today and easily found in the upper Midwest of the United States.

D.
Both are created by removing the top reddish pebble layer to show whiter ground below.