Which of the following colors are part of the visible spectrum?
A. violet
B. blue
C. red
D. all of these

D

Explanation:

The colors of the visible spectrum include red, orange, yellow, green, blue, indigo, and violet.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.