The correct option is B Retina
The retinal pigment epithelium (RPE) is the pigmented cell layer, located just outside the retina and is attached to choroid, a layer filled with blood vessels that nourish the retina. The RPE closely interacts with photoreceptors and thereby maintenance of visual function. It is composed of a single layer of hexagonal cells, which are densely packed with granules of melanin that absorbs the light energy that arrive to the retina.