Ashima is mixing dye to make the lightest green she can manage to make. She adds one drop of dark green dye at a time to a cup of white dye. After 22 drops, she begins to see green instead of white; therefore, 22 drops achieves her “green.” This is best described as an example of:
A) transduction.
B) absolute threshold.
C) perceptual constancy.
D) sensory adaptation.