The correct option is
C Lipid reserve
Spherosomes also are known as plant lysosomes, single half unit membrane covered small spherical organelles which synthesize and store fats. They develop from the endoplasmic reticulum. They are spherical bodies with a diameter of about 0.5-1 mm. They contain granular contents, rich in lipids but also have some proteins. Some proteins are probably enzymatic and take part in the synthesis of fat and lipids.
So, the correct option is 'C'.