To protect them from ultraviolet rays from the sun.
D. because White paper reflects all of the light that hits it. Whatever color that light is, the paper appears to be that color, since paper of that color would reflect only that color if white light was shone on it. That is, blue paper reflects the same color when white light is shone on it as white paper does when blue is shone on it.
The Answer is B) Bilateral Symmetry
