The correct option is
D Parenchyma
In the different regions of the plant body parenchyma cells are involved in different functions. Prosenchyma is a type of parenchyma where cells are elongated with tapering ends. Prosenchyma cells are starch-containing parenchymal cells whose cell walls have become lined with lignin, as occurs in the stems of
Bougainvillea (Nyctaginaceae). A specialized type of parenchyma cell, called a transfer cell, is involved in the short-distance movement of solutes by cell-to-cell transfer. Transfer cells occur in association with veins in leaves and stems and also in many reproductive parts.
So, the correct answer is 'Parenchyma'.