The correct option is A Cones
The retina contains the cells that respond to light. These specialized cells are called as photoreceptors. There are 2 types of photoreceptors in the retina: rods and cones. Cones are most sensitive to one of three different colours (green, red or blue). Signals from the cones are sent to the brain, which then translates these messages into the perception of colour. Cones work only in bright light.