Which Best Illustrates Photoreceptor Adaptation

Which best illustrates photoreceptor adaptation?

A) Your photoreceptors have evolved to see many different colors.
B) You perceive the color red differently if it is placed next to the color blue rather than next to another red object.
C) You find it difficult to avoid walking into objects when you first enter a dark room, until your eyes adjust.
D) You are able to identify colors easily, except for differences between red and green.