Each Cone Responds Primarily to a Single Color

Multiple Choice

Each cone responds primarily to a single color. What kinds of cones are present in the human retina?

A) Two cones that perceive red or blue light.
B) Three cones that perceive red, blue, or green light.
C) Three cones that perceive orange, green, or purple light.
D) Three cones that perceive red, blue, or yellow light.
E) Four cones that perceive red, blue, yellow, or green light.