Although there are no physical differences between the visual organs of the two groups, the inhabitants of the Bilge Islands, when shown a card displaying a spectrum of colors, perceived fewer colors than do most persons in the United States.

Which of the following conclusions can most reliably be drawn from the information above? ​

A) Human color perception is at least partly determined by factors other than the physical structure of the visual organs. ​
B) The Bilge Islanders are probably taught in childhood to recognize fewer colors than are persons in the United States. ​
C) Differences in social structure probably affect color perception.
D) ​Color perception in humans is influenced by differences in physical environment. ​
E) Bilge Islanders may have fewer terms denoting colors in their language than do English-speaking persons.
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