Halos and sundogs (parhelions), two examples of light dispersion, occur when ice crystals disperse sunlight. In both cases, white light enters the ice crystal and is bent at an angle of 22 degrees on its way out. Whether observers see a halo or a sundog depends mainly on
the position of the ice crystals as the sunlight hits them. When sunlight goes through one of the crystal's broad six-sided faces, the result is
a halo. Should light enter and exit one of the edges of the ice crystal, viewers will see a sundog.
Which sentence BEST summarizes the passage?

(A) Halos and sundogs are both examples of light dispersion; both occur when light passes through ice crystals' broad faces.

(B) Halos and sundogs both involve the dispersion of sunlight by ice crystals; both are the result of sunlight passing through the
ice crystals' edges.

(C) Halos and sundogs are both examples of light dispersion; the difference relates to the degree at which light is bent when it
passes through ice crystals.

(D) Halos and sundogs both involve the dispersion of sunlight by ice crystals; the difference relates to the position of the ice
crystals when sunlight passes through