Question

Why did people in the early Americas not use the wheel?

a. They failed to invent the wheel.
b. Boats were preferred for transportation.
c. There were no large animals to pull wagons.
d. Anything circular was viewed as an omen of bad luck.

Answer 1

My educated guess would be A. 
The Americans kept on failing the circular shape of the wheel and that's why they didn't use the wheel.