The function of central vacuole in a plant cell 

• In a cell, lots of cell organelles are present, which perform different functions.
• The vacuole is a  vacant space in the cytoplasm bound by the membrane and is one of the types of organelle present in the cell.
• In both animal and plant cells have vacuoles, but animal cells have fewer and smaller vacuoles than plant cells.
• The plants have a large vacuole present in the center that not only gives support structurally but also helps in the preservation of nutrients. 
• They also act as the reservoir of waste and also water.

Hence, option D is the correct answer.