Why Are Westerners More Likely Than People from New Guinea

Why are Westerners more likely than people from New Guinea or India to see the Müller-Lyer illusion?

A) Western philosophy maintains that spatial or mathematical problems have only one correct answer.
B) Westerners are more accustomed to environments that consist of right angles,rectangles,and straight lines.
C) Those of Western descent tend to have more cones than rods,decreasing their ability to see faint contrast.
D) Westerners tend to rely more on their visual senses than their auditory or olfactory senses.