The correct option is B Retina
Photoreceptors cones and rods are present in retina only. Cones are present throughout the retina but fovea centralis is the part of the retina that has densely packed cones. Sclerotic is the white and opaque outer layer of the eyeball. The cornea is the transparent anterior window of an outer layer of the eyeball located within otherwise opaque sclera. Thus, the correct answer is option B.