The correct answer is (d).
Ribosomes are organelles that are responsible for protein synthesis. Mitochondria are organelles that are responsible for energy production. The Golgi apparatus is an organelle that is responsible for packaging and exporting proteins. Vacuoles are organelles that are filled with fluid and can store nutrients, waste products, and other materials.
Vacuoles are the largest organelles in plant cells and can occupy up to 90% of the cell’s volume. They are filled with a fluid called cell sap, which contains dissolved sugars, salts, and other nutrients. The turgor pressure of the cell sap, which is the pressure exerted by the fluid against the cell wall, helps to maintain the shape and rigidity of the plant cell.
The other options are incorrect because they are not responsible for the turgidity and rigidity of plant cells. Ribosomes are responsible for protein synthesis, mitochondria are responsible for energy production, and the Golgi apparatus is responsible for packaging and exporting proteins.