A contractor made a small error in laying the foundation of a building. Instead of being level, the foundation was at an angle of two degrees. After the building was built, the entire structure leaned dangerously to the left and had to be torn down.

What does this building demonstrate about systems in general?
A.
The affect of a change in a system is always predictable.
B.
Systems built by people cannot change.
C.
Small changes in a system have only small effects.
D.
Small changes in a system can produce very large differences.