While Watching the Sun Set in Your Garden, You Notice

Multiple Choice

While watching the sun set in your garden, you notice that at first, the red-colored flowers are very vibrant compared to the blue flowers. However, as the sunlight begins to fade, you notice this reverses: the red flowers start to look dull and dark while the blue flowers look vibrant and bright. What is this phenomenon known as?

A) Monochromacy
B) The Thatcher effect
C) Acute color blindness
D) The Purkinje effect
E) Protanopia