The correct option is C undifferentiated
Monocot leaves are isobilateral leaves as both the surfaces of the leaf are similar in structure.
The mesophyll is made up of parenchyma cells that have chloroplasts and perform photosynthesis. Such parenchyma is called chlorenchyma. In monocot leaves, the mesophyll tissue is not differentiated into palisade and spongy parenchyma.
In dicot leaves, the mesophyll is differentiated into palisade and spongy parenchyma. with chloroplasts.
Palisade parenchyma is made up of elongated cells that are arranged vertically parallel to each other along the adaxial epidermis.
Spongy parenchyma is made up of oval or round cells with a lot of intercellular spaces and air cavities between them.