The correct option is B Palisade mesophyll
In an actively photosynthesizing plant, light absorption happens in the palisade mesophyll tissue of the leaf. Palisade cells contain many chloroplasts, which makes them the primary site of photosynthesis in the leaves of those plants that contain them, converting the energy in light to the chemical energy of carbohydrates. Photosynthetic processes in the mesophyll result in the production of oxygen.