The correct option is D Xylem parenchyma
Parenchyma cells are the only live cells in the xylem. Thin cell walls, big vacuoles, a conspicuous nucleus, and protoplasts characterise them. They come in a variety of morphologies, but the most common are cylindrical and lobed. The xylem parenchyma cells in the trunks of woody plants are colourless and are thought to be important in storing starch, oils, and other ergastic compounds. They aid in water lateral conduction.