The correct option is B Parenchyma
The most common type of ground tissue is parenchyma. Parenchyma cells are living cells and may remain meristematic at maturity meaning that they are capable of cell division, if stimulated. They have thin but flexible cellulose cell walls and are generally polyhedral when close-packed, but can be roughly spherical when isolated from their neighbours. They have large central vacuoles, which allow the cells to store and regulate ions, waste products and water. Tissue specialised for food storage is commonly formed of parenchyma cells.
Thus, the correct answer is option D.