The correct option is A Pupil
The pupil is a hole or opening in the middle of iris that controls the amount of light entering the eye. The cornea is the transparent anterior window of an outer layer of the eyeball located within otherwise opaque sclera. Fovea centralis is the part of the retina that has densely packed cones. The lens is attached to the ciliary body by ligaments and divides the eye into anterior and posterior compartments. Thus, the correct answer is option A.