The correct answer is the mesophyll tissue from a leaf.
The mesophyll is the term given to the two cell layers present within the leaves of a plant. The first layer is situated within the epidermis but above the second layer. The second layer is the palisade parenchyma cells.
The palisade layer is loaded with ample of chloroplasts, making it the layer most directly accountable for photosynthesis. These chloroplasts absorb the maximum part of the light energy utilized by the leaf.