Answer:
The Gestalt principle responsible for this ability is <em>Similarity</em>
Explanation:
According to the principle of <em>Similarity</em>, things that are alike tend to be grouped together. In observing a football match, our brain groups individuals based on the colors of their uniforms regardless of the position they are in.
I think it would be A.) when they no longer had to survive in the wild sheep brains began to shrink