The Human Spine Acts Like a Weight-Bearing Column

The human spine acts like a weight-bearing column. Compare this to the spine of a horse, which acts like an elastic suspension bridge. Which organism would you predict to experience more back pain and why?

A) the horse, because its spine is less evolutionarily advanced
B) the horse, because its spine supports more organ systems than a human's spine supports
C) the human, because in order to walk upright, the human spine must be compressed
D) the human, because the human spine has longer neurons