In the avian and mammalian eye,the lens remains stationary but changes shape in order to focus on objects at various distances.This is called "accommodation" and is accomplished through adjusting muscle control of the lens in order to

A)alter the sensitivity of the eye to varying light levels.
B)bend light rays to varying degrees according to the angle at which light enters the eye.
C)regulate the vitreous humor volume.
D)control the amount of light admitted to the eye through the pupil.
E)convert light energy into electrical signals by the retina.