While the Trichromatic Theory of Colour Perception Was First Formulated

Multiple Choice

While the trichromatic theory of colour perception was first formulated in the 1800s, research in the 1960s suggested that there were ________ kinds of cones and that each was sensitive to either ________.

A) two; red or blue
B) three; red, green, or white
C) two; red or green
D) three; red, green, or blue